TCPServer Class
Properties Methods Events Config Settings Errors
The TCPServer Class is a generic Transmission Control Protocol (TCP) server class based on an asynchronous, event-driven architecture. It is designed to balance the load between connections for a fast, powerful server.
Syntax
ipworks.tcpserver()
Remarks
The TCPServer Class supports both plaintext and Secure Sockets Layer/Transport Layer Security (SSL/TLS) connections. When connecting over SSL/TLS the SSLServerAuthentication event allows you to check the server identity and other security attributes. The SSLStatus event provides information about the SSL handshake. Additional SSL related settings are also supported via the Config method. The SSLCert properties are used to select a certificate for the server. Note: A valid certificate MUST be selected before the server can function.
TCPServer is the server complement of TCPClient, which is used to create client applications. They share a common design philosophy and interface. We expect you will find TCPServer as easy to use as TCPClient.
By default, each instance of TCPServer can handle up to 1,000 simultaneous incoming connections. This number may be increased up to 100,000 or decreased to a lower value by using the MaxConnections configuration setting.
The connections are identified by a ConnectionId, an Id generated by the component to identify each connection. This Id is unique to each connection. TCPServer's events also have ConnectionId as a parameter to identify the connection they relate to.
Our main goal in designing TCPServer was to make it easy to use without sacrificing performance. The class has a minimum of properties, and six events: ConnectionRequest, Connected, DataIn, Disconnected, ReadyToSend, and Error.
TCPServer can start to listen on a port by setting the Listening property to True. When a remote host asks for a connection, the ConnectionRequest event is fired. At that point, the connection can either be accepted or rejected. If the connection is accepted, a ConnectionId is assigned, and communication can start. From this point on, the operation is very similar to TCPClient. Data are sent by assigning the data string to the DataToSend property. The address and port of the incoming connection can be found by querying the RemoteHost and RemotePort properties.
Note: Server components are designed to process events as they occur. To ensure that events are processed in a timely manner, DoEvents should be called in a loop after the server is started.
Property List
The following is the full list of the properties of the class with short descriptions. Click on the links for further details.
ConnectionBacklog | This property includes the maximum number of pending connections maintained by the Transmission Control Protocol (TCP)/IP subsystem. |
Connections | This property includes a collection of currently connected clients. |
DefaultEOL | This property includes a default end-of-line (EOL) value to be used by incoming connections. |
DefaultIdleTimeout | This property includes the default idle timeout for inactive clients. |
DefaultMaxLineLength | The property includes the default maximum line length value for inbound connections. |
DefaultSingleLineMode | This property tells the class whether or not to treat new connections as line oriented. |
DefaultTimeout | This property includes an initial timeout value to be used by incoming connections. |
KeepAlive | When True, KEEPALIVE packets are enabled (for long connections). |
Linger | When set to True, connections are terminated gracefully. |
Listening | If set to True, the class accepts incoming connections on LocalPort. |
LocalHost | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
LocalPort | This property includes the Transmission Control Protocol (TCP) port in the local host where the class listens. |
SSLAuthenticateClients | If set to True, the server asks the client(s) for a certificate. |
SSLCert | The certificate to be used during SSL negotiation. |
SSLEnabled | Whether TLS/SSL is enabled. |
SSLProvider | This specifies the SSL/TLS implementation to use. |
SSLStartMode | Determines how the class starts the SSL negotiation. |
Method List
The following is the full list of the methods of the class with short descriptions. Click on the links for further details.
ChangeRecordLength | This method changes the length of received data records. |
Config | Sets or retrieves a configuration setting. |
Disconnect | This method disconnects the specified client. |
DoEvents | Processes events from the internal message queue. |
Interrupt | This method interrupts a synchronous send to the remote host. |
PauseData | This method pauses data reception. |
ProcessData | This method reenables data reception after a call to PauseData . |
Reset | Reset the class. |
Send | This method sends binary data to the specified client. |
SendBytes | This method sends binary data to the specified client. |
SendFile | This method sends the file to the remote host. |
SendLine | This method sends a string followed by a new line. |
SendText | This method sends text to the specified client. |
Shutdown | This method shuts down the server. |
StartListening | This method starts listening for incoming connections. |
StartSSL | This method starts the Secure Sockets Layer (SSL) negotiation on a connection. |
StopListening | This method stops listening for new connections. |
Event List
The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.
Connected | This event is fired immediately after a connection completes (or fails). |
ConnectionRequest | This event is fired when a request for connection comes from a remote host. |
DataIn | This event is fired when data come in. |
Disconnected | This event is fired when a connection is closed. |
Error | This event fires information about errors during data delivery. |
ReadyToSend | This event is fired when the class is ready to send data. |
SSLClientAuthentication | This event is fired when the client presents its credentials to the server. |
SSLConnectionRequest | This event fires when a Secure Sockets Layer (SSL) connection is requested. |
SSLStatus | This event is fired to show the progress of the secure connection. |
Config Settings
The following is a list of config settings for the class with short descriptions. Click on the links for further details.
AllowedClients | A comma-separated list of host names or IP addresses that can access the class. |
BindExclusively | Whether or not the class considers a local port reserved for exclusive use. |
BlockedClients | A comma-separated list of host names or IP addresses that cannot access the class. |
DefaultConnectionTimeout | The inactivity timeout applied to the SSL handshake. |
InBufferSize | The size in bytes of the incoming queue of the socket. |
KeepAliveInterval | The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received. |
KeepAliveTime | The inactivity time in milliseconds before a TCP keep-alive packet is sent. |
MaxConnections | The maximum number of connections available. |
OutBufferSize | The size in bytes of the outgoing queue of the socket. |
TcpNoDelay | Whether or not to delay when sending packets. |
UseIPv6 | Whether to use IPv6. |
LogSSLPackets | Controls whether SSL packets are logged when using the internal security API. |
OpenSSLCADir | The path to a directory containing CA certificates. |
OpenSSLCAFile | Name of the file containing the list of CA's trusted by your application. |
OpenSSLCipherList | A string that controls the ciphers to be used by SSL. |
OpenSSLPrngSeedData | The data to seed the pseudo random number generator (PRNG). |
ReuseSSLSession | Determines if the SSL session is reused. |
SSLAcceptAnyServerCert | Whether to trust any certificate presented by the server. |
SSLCACerts | A newline separated list of CA certificate to use during SSL client authentication. |
SSLCipherStrength | The minimum cipher strength used for bulk encryption. |
SSLEnabledCipherSuites | The cipher suite to be used in an SSL negotiation. |
SSLEnabledProtocols | Used to enable/disable the supported security protocols. |
SSLEnableRenegotiation | Whether the renegotiation_info SSL extension is supported. |
SSLIncludeCertChain | Whether the entire certificate chain is included in the SSLServerAuthentication event. |
SSLKeyLogFile | The location of a file where per-session secrets are written for debugging purposes. |
SSLNegotiatedCipher | Returns the negotiated ciphersuite. |
SSLNegotiatedCipherStrength | Returns the negotiated ciphersuite strength. |
SSLNegotiatedCipherSuite | Returns the negotiated ciphersuite. |
SSLNegotiatedKeyExchange | Returns the negotiated key exchange algorithm. |
SSLNegotiatedKeyExchangeStrength | Returns the negotiated key exchange algorithm strength. |
SSLNegotiatedVersion | Returns the negotiated protocol version. |
SSLSecurityFlags | Flags that control certificate verification. |
SSLServerCACerts | A newline separated list of CA certificate to use during SSL server certificate validation. |
TLS12SignatureAlgorithms | Defines the allowed TLS 1.2 signature algorithms when SSLProvider is set to Internal. |
TLS12SupportedGroups | The supported groups for ECC. |
TLS13KeyShareGroups | The groups for which to pregenerate key shares. |
TLS13SignatureAlgorithms | The allowed certificate signature algorithms. |
TLS13SupportedGroups | The supported groups for (EC)DHE key exchange. |
BuildInfo | Information about the product's build. |
CodePage | The system code page used for Unicode to Multibyte translations. |
LicenseInfo | Information about the current license. |
MaskSensitive | Whether sensitive data is masked in log messages. |
UseInternalSecurityAPI | Tells the class whether or not to use the system security libraries or an internal implementation. |
TCPServer.ConnectionBacklog Property
This property includes the maximum number of pending connections maintained by the Transmission Control Protocol (TCP)/IP subsystem.
Syntax
getConnectionBacklog(): number; setConnectionBacklog(connectionBacklog: number): void;
Default Value
5
Remarks
This property contains the maximum number of pending connections maintained by the TCP/IP subsystem. This value reflects the SOMAXCONN option for the main listening socket. The default value for most systems is 5. You may set this property to a larger value if the server is expected to receive a large number of connections, and queuing them is desirable.
This property is not available at design time.
TCPServer.Connections Property
This property includes a collection of currently connected clients.
Syntax
getConnections(): ConnectionMap;
Default Value
Remarks
This property contains a collection of currently connected clients. All of the connections may be managed using this property. Each connection is described by the different fields of the Connection type.
This collection is a hash-table type of collection, in which the Connection Id string is used as the key to the desired connection. You may acquire the key for a given connection through the Connected event.
Example (Broadcasting Data)
For i = 0 to Control.ConnectionCount
Control.DataToSend(Control.ConnectionId(i)) = "Broadcast Data"
Next i
This property is read-only.
TCPServer.DefaultEOL Property
This property includes a default end-of-line (EOL) value to be used by incoming connections.
Syntax
getDefaultEOL(): Uint8Array; setDefaultEOL(defaultEOL: Uint8Array): void;
Default Value
""
Remarks
This property contains a default end-of-line (EOL) value to be used by incoming connections. Once the class accepts and establishes an inbound connection, it will set that connection's EOL to the value in this property. By default, this value is empty (""), meaning that data will be fired as it is received.
TCPServer.DefaultIdleTimeout Property
This property includes the default idle timeout for inactive clients.
Syntax
getDefaultIdleTimeout(): number; setDefaultIdleTimeout(defaultIdleTimeout: number): void;
Default Value
0
Remarks
This property specifies the idle timeout (in seconds) for clients. When set to a positive value, the class will disconnect idle clients after the specified timeout.
This applies only to clients that have not sent or received data within DefaultIdleTimeout seconds.
If set to 0 (default), no idle timeout is applied.
Note: DoEvents must be called for the class to check existing connections.
TCPServer.DefaultMaxLineLength Property
The property includes the default maximum line length value for inbound connections.
Syntax
getDefaultMaxLineLength(): number; setDefaultMaxLineLength(defaultMaxLineLength: number): void;
Default Value
2048
Remarks
This property controls the default size of an internal buffer that holds received data while waiting for an end-of-line (EOL) string.
The minimum value for this property is 256 bytes. The default value is 2048 bytes.
TCPServer.DefaultSingleLineMode Property
This property tells the class whether or not to treat new connections as line oriented.
Syntax
isDefaultSingleLineMode(): boolean; setDefaultSingleLineMode(defaultSingleLineMode: boolean): void;
Default Value
FALSE
Remarks
This property instructs the component whether or not to treat newly established connections as line-oriented protocols. If this value is True, newly accepted connections will read the incoming data stream as lines separated by a carriage return line feed (CRLF), carriage return (CR), or line feed (LF) and will ignore the end of lines (EOLs).
TCPServer.DefaultTimeout Property
This property includes an initial timeout value to be used by incoming connections.
Syntax
getDefaultTimeout(): number; setDefaultTimeout(defaultTimeout: number): void;
Default Value
0
Remarks
This property is used by the class to set the operational timeout value of all inbound connections once they are established.
By default, the timeout is 0, meaning that all inbound connections will behave asynchronously.
TCPServer.KeepAlive Property
When True, KEEPALIVE packets are enabled (for long connections).
Syntax
isKeepAlive(): boolean; setKeepAlive(keepAlive: boolean): void;
Default Value
FALSE
Remarks
This property enables the SO_KEEPALIVE option on the incoming connections. This option prevents long connections from timing out in case of inactivity.
Note: System Transmission Control Protocol (TCP)/IP stack implementations are not required to support SO_KEEPALIVE.
This property is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified.
TCPServer.Linger Property
When set to True, connections are terminated gracefully.
Syntax
isLinger(): boolean; setLinger(linger: boolean): void;
Default Value
TRUE
Remarks
This property controls how a connection is closed. The default is True. In this case, the connection is closed only after all the data are sent. Setting it to False forces an abrupt (hard) disconnection. Any data that were in the sending queue may be lost.
The default behavior (which is also the default mode for stream sockets) might result in an indefinite delay in closing the connection. Although the class returns control immediately, the system might indefinitely hold system resources until all pending data are sent (even after your application closes). This means that valuable system resources might be wasted.
Setting this property to False forces an immediate disconnection. If you know that the other side has received all the data you have sent (e.g., by a client acknowledgment), then setting this property to False might be the appropriate course of action.
This property is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified.
TCPServer.Listening Property
If set to True, the class accepts incoming connections on LocalPort.
Syntax
isListening(): boolean;
Default Value
FALSE
Remarks
This property indicates whether the class is listening for connections on the port specified by the LocalPort property.
Note: Use the StartListening and StopListening methods to control whether the class is listening.
This property is not available at design time.
TCPServer.LocalHost Property
The name of the local host or user-assigned IP interface through which connections are initiated or accepted.
Syntax
getLocalHost(): string; setLocalHost(localHost: string): void;
Default Value
""
Remarks
The LocalHost property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.
In multi-homed hosts (machines with more than one IP interface) setting LocalHost to the value of an interface will make the class initiate connections (or accept in the case of server classs) only through that interface.
If the class is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multi-homed hosts (machines with more than one IP interface).
NOTE: LocalHost is not persistent. You must always set it in code, and never in the property window.
TCPServer.LocalPort Property
This property includes the Transmission Control Protocol (TCP) port in the local host where the class listens.
Syntax
getLocalPort(): number; setLocalPort(localPort: number): void;
Default Value
0
Remarks
This property must be set before the class can start listening. If its value is 0, then the TCP/IP subsystem picks a port number at random. The port number can be found by checking the value of this property after the class is listening (i.e., after successfully assigning True to the Listening property).
The service port is not shared among servers so two classs cannot be listening on the same port at the same time.
TCPServer.SSLAuthenticateClients Property
If set to True, the server asks the client(s) for a certificate.
Syntax
isSSLAuthenticateClients(): boolean; setSSLAuthenticateClients(SSLAuthenticateClients: boolean): void;
Default Value
FALSE
Remarks
This property is used in conjunction with the SSLClientAuthentication event. Please refer to the documentation of the SSLClientAuthentication event for details.
TCPServer.SSLCert Property
The certificate to be used during SSL negotiation.
Syntax
getSSLCert(): Certificate; setSSLCert(SSLCert: Certificate): void;
Default Value
Remarks
The digital certificate that the class will use during SSL negotiation. Set this property to a valid certificate before starting SSL negotiation. To set a certificate, you may set the field to the encoded certificate. To select a certificate, use the store and subject fields.
TCPServer.SSLEnabled Property
Whether TLS/SSL is enabled.
Syntax
isSSLEnabled(): boolean; setSSLEnabled(SSLEnabled: boolean): void;
Default Value
FALSE
Remarks
This setting specifies whether TLS/SSL is enabled in the class. When False (default) the class operates in plaintext mode. When True TLS/SSL is enabled.
TLS/SSL may also be enabled by setting SSLStartMode. Setting SSLStartMode will automatically update this property value.
This property is not available at design time.
TCPServer.SSLProvider Property
This specifies the SSL/TLS implementation to use.
Syntax
getSSLProvider(): TcpserverSSLProviders; setSSLProvider(SSLProvider: TcpserverSSLProviders): void;
enum TcpserverSSLProviders { sslpAutomatic, sslpPlatform, sslpInternal }
Default Value
0
Remarks
This property specifies the SSL/TLS implementation to use. In most cases the default value of 0 (Automatic) is recommended and should not be changed. When set to 0 (Automatic) the class will select whether to use the platform implementation or the internal implementation depending on the operating system as well as the TLS version being used.
Possible values are:
0 (sslpAutomatic - default) | Automatically selects the appropriate implementation. |
1 (sslpPlatform) | Uses the platform/system implementation. |
2 (sslpInternal) | Uses the internal implementation. |
In most cases using the default value (Automatic) is recommended. The class will select a provider depending on the current platform.
When Automatic is selected the platform implementation will be used by default in all cases in the JavaScript edition.
Note: The Internal provider is not support at this time.
TCPServer.SSLStartMode Property
Determines how the class starts the SSL negotiation.
Syntax
getSSLStartMode(): TcpserverSSLStartModes; setSSLStartMode(SSLStartMode: TcpserverSSLStartModes): void;
enum TcpserverSSLStartModes { sslAutomatic, sslImplicit, sslExplicit, sslNone }
Default Value
3
Remarks
The SSLStartMode property may have one of the following values:
0 (sslAutomatic) | If the remote port is set to the standard plaintext port of the protocol (where applicable), the class will behave the same as if SSLStartMode is set to sslExplicit. In all other cases, SSL negotiation will be implicit (sslImplicit). |
1 (sslImplicit) | The SSL negotiation will start immediately after the connection is established. |
2 (sslExplicit) | The class will first connect in plaintext, and then explicitly start SSL negotiation through a protocol command such as STARTTLS. |
3 (sslNone - default) | No SSL negotiation, no SSL security. All communication will be in plaintext mode. |
TCPServer.changeRecordLength Method
This method changes the length of received data records.
Syntax
async tcpserver.changeRecordLength(connectionId : string, recordLength : number): Promise<void>
Remarks
This method defines the length of data records to be received (in bytes) for the specified ConnectionId.
If RecordLength is set to a positive value, the class will accumulate data until RecordLength bytes of data are received and only then will fire the DataIn event with data of the specified length RecordLength. This allows data to be received as records of known length. This method can be called at any time to change the record length, including within the DataIn event.
A value of 0 (default) means this functionality is not used.
TCPServer.config Method
Sets or retrieves a configuration setting.
Syntax
async tcpserver.config(configurationString : string): Promise<string>
Remarks
Config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.
These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.
To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).
To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.
TCPServer.disconnect Method
This method disconnects the specified client.
Syntax
async tcpserver.disconnect(connectionId : string): Promise<void>
Remarks
Calling this method will disconnect the client specified by the ConnectionId parameter.
TCPServer.doEvents Method
Processes events from the internal message queue.
Syntax
async tcpserver.doEvents(): Promise<void>
Remarks
When DoEvents is called, the class processes any available events. If no events are available, it waits for a preset period of time, and then returns.
TCPServer.interrupt Method
This method interrupts a synchronous send to the remote host.
Syntax
async tcpserver.interrupt(connectionId : string): Promise<void>
Remarks
This property is called using the Connection Id if you wish to interrupt a connection and stop a file from uploading without disconnecting the client connected to the class. If you use SendFile to upload a file, the class will run synchronously on that Connection Id until it is completed.
TCPServer.pauseData Method
This method pauses data reception.
Syntax
async tcpserver.pauseData(connectionId : string): Promise<void>
Remarks
This method pauses data reception for the connection identified by ConnectionId when called. While data reception is paused, the DataIn event will not fire for the specified connection. Call ProcessData to reenable data reception.
TCPServer.processData Method
This method reenables data reception after a call to PauseData .
Syntax
async tcpserver.processData(connectionId : string): Promise<void>
Remarks
This method reenables data reception for the connection identified by ConnectionId after a previous call to PauseData. When PauseData is called, the DataIn event will not fire for the specified connection. To reenable data reception and allow DataIn to fire, call this method.
Note: This method is used only after previously calling PauseData. It does not need to be called to process incoming data by default.
TCPServer.reset Method
Reset the class.
Syntax
async tcpserver.reset(): Promise<void>
Remarks
This method will reset the class's properties to their default values.
TCPServer.send Method
This method sends binary data to the specified client.
Syntax
async tcpserver.send(connectionId : string, text : Uint8Array): Promise<void>
Remarks
This method sends binary data to the client identified by ConnectionId. To send text, use the SendText method instead.
When ConnectionsTimeout is set to 0, the class will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again.
Note: The ReadyToSend event is not fired when part of the data is sent successfully.
TCPServer.sendBytes Method
This method sends binary data to the specified client.
Syntax
async tcpserver.sendBytes(connectionId : string, data : Uint8Array): Promise<void>
Remarks
This method sends binary data to the client identified by ConnectionId. To send text, use the SendText method instead.
When ConnectionsTimeout is set to 0, the class will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again.
Note: The ReadyToSend event is not fired when part of the data is sent successfully.
TCPServer.sendFile Method
This method sends the file to the remote host.
Syntax
async tcpserver.sendFile(connectionId : string, fileName : string): Promise<void>
Remarks
This method sends the file to the client specified by the ConnectionId.
TCPServer.sendLine Method
This method sends a string followed by a new line.
Syntax
async tcpserver.sendLine(connectionId : string, text : string): Promise<void>
Remarks
This method is used to send data with line-oriented protocols. The line is followed by .
Please refer to the GetLine method and SingleLineMode property for more information.
TCPServer.sendText Method
This method sends text to the specified client.
Syntax
async tcpserver.sendText(connectionId : string, text : string): Promise<void>
Remarks
This method sends text to the client identified by ConnectionId. To send binary data, use the SendBytes method instead.
When ConnectionsTimeout is set to 0, the class will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again.
Note: The ReadyToSend event is not fired when part of the data is sent successfully.
TCPServer.shutdown Method
This method shuts down the server.
Syntax
async tcpserver.shutdown(): Promise<void>
Remarks
This method shuts down the server. Calling this method is equivalent to calling StopListening and then breaking every client connection by calling Disconnect.
TCPServer.startListening Method
This method starts listening for incoming connections.
Syntax
async tcpserver.startListening(): Promise<void>
Remarks
This method begins listening for incoming connections on the port specified by LocalPort. Once listening, events will fire as new clients connect and data are transferred.
To stop listening for new connections, call StopListening. To stop listening for new connections and to disconnect all existing clients, call Shutdown.
TCPServer.startSSL Method
This method starts the Secure Sockets Layer (SSL) negotiation on a connection.
Syntax
async tcpserver.startSSL(connectionId : string): Promise<void>
Remarks
This method is used to start the SSL negotiation on a plaintext connection. Please refer to the SSLStartMode property for more information.
Note: The Connected event will fire again after the SSL negotiation is complete.
TCPServer.stopListening Method
This method stops listening for new connections.
Syntax
async tcpserver.stopListening(): Promise<void>
Remarks
This method stops listening for new connections. After being called, any new connection attempts will be rejected. Calling this method does not disconnect existing connections.
To stop listening and to disconnect all existing clients, call Shutdown instead.
TCPServer.Connected Event
This event is fired immediately after a connection completes (or fails).
Syntax
tcpserver.on('Connected', listener: (e: {readonly connectionId: string, readonly statusCode: number, readonly description: string}) => void )
Remarks
If the connection is made normally, StatusCode is 0, and Description is "OK".
If the connection fails, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.
Please refer to the Error Codes section for more information.
TCPServer.ConnectionRequest Event
This event is fired when a request for connection comes from a remote host.
Syntax
tcpserver.on('ConnectionRequest', listener: (e: {readonly address: string, readonly port: number, accept: boolean}) => void )
Remarks
This event indicates an incoming connection. The connection is accepted by default. Address and Port will contain information about the remote host requesting the inbound connection. If you want to refuse it, you can set the Accept parameter to False.
TCPServer.DataIn Event
This event is fired when data come in.
Syntax
tcpserver.on('DataIn', listener: (e: {readonly connectionId: string, readonly text: string, readonly textB: Uint8Array, readonly EOL: boolean}) => void )
Remarks
Trapping the DataIn event is your only chance to get the data coming from the other end of the connection specified by ConnectionId. The incoming data are provided through the Text parameter.
EOL indicates whether or not the EOL string was found at the end of Text. If the EOL string was found, then EOL is True.
If Text is part of the data portion of length larger than either DefaultMaxLineLength or with no EOL strings in it, then EOL is False. Please note that this means that one or more DataIn events with EOL set to False can be received during a connection.
If the EOL property is "" (empty string), then EOL can be disregarded (it is always True).
Note: Events are not re-entrant. Performing time-consuming operations within this event will prevent it from firing again in a timely manner and may affect overall performance.
TCPServer.Disconnected Event
This event is fired when a connection is closed.
Syntax
tcpserver.on('Disconnected', listener: (e: {readonly connectionId: string, readonly statusCode: number, readonly description: string}) => void )
Remarks
If the connection is broken normally, StatusCode is 0, and Description is "OK".
If the connection is broken for any other reason, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.
Please refer to the Error Codes section for more information.
TCPServer.Error Event
This event fires information about errors during data delivery.
Syntax
tcpserver.on('Error', listener: (e: {readonly connectionId: string, readonly errorCode: number, readonly description: string}) => void )
Remarks
The Error event is fired in case of exceptional conditions during message processing. Normally, the class .
ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.
ConnectionId indicates the connection for which the error is applicable.
TCPServer.ReadyToSend Event
This event is fired when the class is ready to send data.
Syntax
tcpserver.on('ReadyToSend', listener: (e: {readonly connectionId: string}) => void )
Remarks
The ReadyToSend event indicates that the underlying Transmission Control Protocol (TCP)/IP subsystem is ready to accept data after a failed DataToSend. This event is also fired immediately after a connection is established.
TCPServer.SSLClientAuthentication Event
This event is fired when the client presents its credentials to the server.
Syntax
tcpserver.on('SSLClientAuthentication', listener: (e: {readonly connectionId: string, readonly certEncoded: string, readonly certEncodedB: Uint8Array, readonly certSubject: string, readonly certIssuer: string, readonly status: string, accept: boolean}) => void )
Remarks
This event enables the server to decide whether or not to continue. The Accept parameter is a recommendation on whether to continue or to close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.
When Accept is False, Status shows why the verification failed (otherwise, Status contains the string "OK").
TCPServer.SSLConnectionRequest Event
This event fires when a Secure Sockets Layer (SSL) connection is requested.
Syntax
tcpserver.on('SSLConnectionRequest', listener: (e: {readonly connectionId: string, readonly supportedCipherSuites: string, readonly supportedSignatureAlgs: string, certStoreType: number, certStore: string, certPassword: string, certSubject: string}) => void )
Remarks
This event fires when an SSL connection is requested and SSLProvider is set to Internal. This event provides an opportunity to select an alternative certificate to the connecting client. This event does not fire when SSLProvider is set to Platform.
This event allows the class to be configured to use both RSA and ECDSA certificates depending on the connecting client's capabilities.
ConnectionId is the connection Id of the client requesting the connection.
SupportedCipherSuites is a comma-separated list of cipher suites that the client supports.
SupportedSignatureAlgs is a comma-separated list of certificate signature algorithms that the client supports.
CertStoreType is the store type of the alternate certificate to use for this connection. The class supports both public and private keys in a variety of formats. When the cstAuto value is used the class will automatically determine the type. This property can take one of the following values:
0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. Note: this store type is not available in Java. |
1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. Note: this store type is not available in Java. |
2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS12) file containing certificates. |
3 (cstPFXBlob) | The certificate store is a string (binary or base64-encoded) representing a certificate store in PFX (PKCS12) format. |
4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. Note: this store type is only available in Java. |
5 (cstJKSBlob) | The certificate store is a string (binary or base64-encoded) representing a certificate store in Java Key Store (JKS) format. Note: this store type is only available in Java. |
6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. |
7 (cstPEMKeyBlob) | The certificate store is a string (binary or base64-encoded) that contains a private key and an optional certificate. |
8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. |
9 (cstPublicKeyBlob) | The certificate store is a string (binary or base64-encoded) that contains a PEM- or DER-encoded public key certificate. |
10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or base64-encoded) that contains an SSH-style public key. |
11 (cstP7BFile) | The certificate store is the name of a PKCS7 file containing certificates. |
12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS7 format. |
13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. |
14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). |
15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). |
16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. |
17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. |
18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). |
19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). |
21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). Note: this store type is only available in Java and .NET. |
22 (cstBCFKSBlob) | The certificate store is a string (binary or base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. Note: this store type is only available in Java and .NET. |
23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS11 interface.
To use a security key the necessary data must first be collected using the CertMgr class. The ListStoreCertificates method may be called after setting CertStoreType to cstPKCS11, CertStorePassword to the PIN, and CertStore to the full path of the PKCS11 dll. The certificate information returned in the CertList event's CertEncoded parameter may be saved for later use. When using a certificate, pass the previously saved security key information as the and set to the PIN. Code Example: SSH Authentication with Security Key
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99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. |
CertStore is the store name or location of the alternate certificate to use for this connection.
Designations of certificate stores are platform-dependent.
The following are designations of the most common User and Machine certificate stores in Windows:
MY | A certificate store holding personal certificates with their associated private keys. |
CA | Certifying authority certificates. |
ROOT | Root certificates. |
When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e. PKCS12 certificate store).
CertPassword is the password of the certificate store containing the alternate certificate to use for this connection.
CertSubject is the subject of the alternate certificate to use for this connection.
The special value * matches any subject and will select the first certificate in the store. The certificate subject is a comma separated list of distinguished name fields and values. For instance "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are displayed below.
Field | Meaning |
CN | Common Name. This is commonly a host name like www.server.com. |
O | Organization |
OU | Organizational Unit |
L | Locality |
S | State |
C | Country |
E | Email Address |
If a field value contains a comma it must be quoted.
TCPServer.SSLStatus Event
This event is fired to show the progress of the secure connection.
Syntax
tcpserver.on('SSLStatus', listener: (e: {readonly connectionId: string, readonly message: string}) => void )
Remarks
The event is fired for informational and logging purposes only. It is used to track the progress of the connection.
Certificate Type
This is the digital certificate being used.
Remarks
This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.
Fields
EffectiveDate string |
This is the date on which this certificate becomes valid. Before this date, it is not valid. The following example illustrates the format of an encoded date: 23-Jan-2000 15:00:00. |
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Encoded Uint8Array |
This is the certificate (PEM/base64 encoded). This property is used to assign a specific certificate. The and properties also may be used to specify a certificate. When is set, a search is initiated in the current for the private key of the certificate. If the key is found, is updated to reflect the full subject of the selected certificate; otherwise, is set to an empty string. |
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EncodedB byte[] |
This is the certificate (PEM/base64 encoded). This property is used to assign a specific certificate. The and properties also may be used to specify a certificate. When is set, a search is initiated in the current for the private key of the certificate. If the key is found, is updated to reflect the full subject of the selected certificate; otherwise, is set to an empty string. |
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ExpirationDate string |
This is the date the certificate expires. After this date, the certificate will no longer be valid. The following example illustrates the format of an encoded date: 23-Jan-2001 15:00:00. |
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ExtendedKeyUsage string |
This is a comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs). |
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Fingerprint string |
This is the hex-encoded, 16-byte MD5 fingerprint of the certificate. The following example illustrates the format: bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02 |
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FingerprintSHA1 string |
This is the hex-encoded, 20-byte SHA-1 fingerprint of the certificate. The following example illustrates the format: 30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84 |
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FingerprintSHA256 string |
This is the hex-encoded, 32-byte SHA-256 fingerprint of the certificate. The following example illustrates the format: 6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53 |
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Issuer string |
This is the issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate. |
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KeyPassword string |
This is the password for the certificate's private key (if any). Some certificate stores may individually protect certificates' private keys, separate from the standard protection offered by the . . This field can be used to read such password-protected private keys. Note: this property defaults to the value of . To clear it, you must set the property to the empty string (""). It can be set at any time, but when the private key's password is different from the store's password, then it must be set before calling . |
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PrivateKey string |
This is the private key of the certificate (if available). The key is provided as PEM/Base64-encoded data. Note: The may be available but not exportable. In this case, returns an empty string. |
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PrivateKeyAvailable boolean |
This property shows whether a is available for the selected certificate. If is True, the certificate may be used for authentication purposes (e.g., server authentication). |
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PrivateKeyContainer string |
This is the name of the container for the certificate (if available). This functionality is available only on Windows platforms. |
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PublicKey string |
This is the public key of the certificate. The key is provided as PEM/Base64-encoded data. |
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PublicKeyAlgorithm string |
This property contains the textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm. |
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PublicKeyLength number |
This is the length of the certificate's public key (in bits). Common values are 512, 1024, and 2048. |
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SerialNumber string |
This is the serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number. |
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SignatureAlgorithm string |
The property contains the text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm. |
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Store Uint8Array |
This is the name of the certificate store for the client certificate. The property denotes the type of the certificate store specified by . If the store is password protected, specify the password in . is used in conjunction with the property to specify client certificates. If has a value, and or is set, a search for a certificate is initiated. Please see the property for details. Designations of certificate stores are platform-dependent. The following are designations of the most common User and Machine certificate stores in Windows:
When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e. PKCS12 certificate store). |
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StoreB byte[] |
This is the name of the certificate store for the client certificate. The property denotes the type of the certificate store specified by . If the store is password protected, specify the password in . is used in conjunction with the property to specify client certificates. If has a value, and or is set, a search for a certificate is initiated. Please see the property for details. Designations of certificate stores are platform-dependent. The following are designations of the most common User and Machine certificate stores in Windows:
When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e. PKCS12 certificate store). |
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StorePassword string |
If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. |
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StoreType CertStoreTypes |
This is the type of certificate store for this certificate. The class supports both public and private keys in a variety of formats. When the cstAuto value is used the class will automatically determine the type. This property can take one of the following values:
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Subject string |
This is the subject of the certificate used for client authentication. This property must be set after all other certificate properites are set. When this property is set, a search is performed in the current certificate store certificate with matching subject. If a matching certificate is found, the property is set to the full subject of the matching certificate. If an exact match is not found, the store is searched for subjects containing the value of the property. If a match is still not found, the property is set to an empty string, and no certificate is selected. The special value "*" picks a random certificate in the certificate store. The certificate subject is a comma separated list of distinguished name fields and values. For instance "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are displayed below.
If a field value contains a comma it must be quoted. |
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SubjectAltNames string |
This property contains comma-separated lists of alternative subject names for the certificate. |
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ThumbprintMD5 string |
This property contains the MD5 hash of the certificate. If the hash does not already exist, it is computed. |
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ThumbprintSHA1 string |
This property contains the SHA-1 hash of the certificate. If the hash does not already exist, it is computed. |
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ThumbprintSHA256 string |
This property contains the SHA-256 hash of the certificate. If the hash does not already exist, it is computed. |
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Usage string |
This property contains the text description of . This value will be of one or more of the following strings and will be separated by commas:
If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names. |
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UsageFlags number |
This property contains the flags that show intended use for the certificate. The value of is a combination of the following flags:
Please see the property for a text representation of . This functionality currently is not available when the provider is OpenSSL. |
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Version string |
This property contains the certificate's version number. The possible values are the strings "V1", "V2", and "V3". |
Constructors
public Certificate();
Creates a Certificate instance whose properties can be set. This is useful for use with CERTMGR when generating new certificates.
public Certificate(String certificateFile);
Opens CertificateFile and reads out the contents as an X509 public key.
public Certificate(byte[] certificateData);
Parses CertificateData as an X509 public key.
public Certificate(int certStoreType, String store, String storePassword, String subject);
CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a file containing the certificate store. StorePassword is the password used to protect the store. After the store has been successfully opened, the class will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X509 certificate's subject Distinguished Name (DN).
public Certificate(int certStoreType, String store, String storePassword, String subject, String configurationString);
CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a file containing the certificate store. StorePassword is the password used to protect the store. ConfigurationString is a newline separated list of name-value pairs that may be used to modify the default behavior. Possible values include "PersistPFXKey", which shows whether or not the PFX key is persisted after performing operations with the private key. This correlates to the PKCS12_NO_PERSIST_KEY CyrptoAPI option. The default value is True (the key is persisted). "Thumbprint" - a MD5, SHA1, or SHA256 thumbprint of the certificate to load. When specified, this value is used to select the certificate in the store. This is applicable to cstUser, cstMachine, cstPublicKeyFile, and cstPFXFile store types. "UseInternalSecurityAPI" shows whether the platform (default) or the internal security API is used when performing certificate-related operations. After the store has been successfully opened, the class will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X509 certificate's subject Distinguished Name (DN).
public Certificate(int certStoreType, String store, String storePassword, byte[] encoded);
CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a file containing the certificate store. StorePassword is the password used to protect the store. After the store has been successfully opened, the class will load Encoded as an X509 certificate and search the opened store for a corresponding private key.
public Certificate(int certStoreType, byte[] storeBlob, String storePassword, String subject);
CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. StoreBlob is a string (binary- or base64-encoded) containing the certificate data. StorePassword is the password used to protect the store. After the store has been successfully opened, the class will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X509 certificate's subject Distinguished Name (DN).
public Certificate(int certStoreType, byte[] storeBlob, String storePassword, String subject, String configurationString);
CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. StoreBlob is a string (binary- or base64-encoded) containing the certificate data. StorePassword is the password used to protect the store. After the store has been successfully opened, the class will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X509 certificate's subject Distinguished Name (DN).
public Certificate(int certStoreType, byte[] storeBlob, String storePassword, byte[] encoded);
CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a string (binary- or base64-encoded) containing the certificate store. StorePassword is the password used to protect the store. After the store has been successfully opened, the class will load Encoded as an X509 certificate and search the opened store for a corresponding private key.
Connection Type
This is a currently connected client.
Remarks
This type describes the connection of a client that is currently connected to the class. You may use the different fields of this type to manage the connection.
Fields
AcceptData boolean |
Setting this property to False, temporarily disables data reception (and the DataIn event) on the connection. Setting this to True, re-enables data reception. Note: It is recommended to use the PauseData or ProcessData method instead of setting this property. |
BytesSent number |
This property shows how many bytes were sent after the last assignment to . Please check for more information. Note: This property will always return 0 when the class is operating in the synchronous mode (i.e., the Timeout property is set to a positive value). |
Connected boolean |
This property is used to disconnect individual connections or to show their status. The property may be set to false to close the connection. also shows the status of a particular connection (connected/disconnected). How and when the connection is closed is controlled by the Linger property. Please refer to its description for more information. Note: It is recommended to use the Connect or Disconnect method instead of setting this property. |
ConnectionId string |
This property contains an identifier generated by the class to identify each connection. This identifier is unique to this connection. |
DataToSend Uint8Array |
This property contains a string of data to be sent to the remote host. It is a write-only property. Assigning a string to the makes the class send the string to the remote host. The Send method provides similar functionality. When is set to 0, the class will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again. Note: The ReadyToSend event is not fired when part of the data is sent successfully. Note: It is recommended to use the Send or SendBytes method instead of setting this property. |
DataToSendB byte[] |
This property contains a string of data to be sent to the remote host. It is a write-only property. Assigning a string to the makes the class send the string to the remote host. The Send method provides similar functionality. When is set to 0, the class will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again. Note: The ReadyToSend event is not fired when part of the data is sent successfully. Note: It is recommended to use the Send or SendBytes method instead of setting this property. |
EOL Uint8Array |
The EOL property is used to define boundaries in the input stream using the value of the property. The EOL property is especially useful with ASCII files. By setting it to , the incoming ASCII text stream can be split into lines. In this case, one event is fired for each line received (as well as in packet boundaries). The . bytes are discarded. The EOL property is a binary string. This means that it can be more than one byte long, and it can contain NULL bytes. |
EOLB byte[] |
The EOL property is used to define boundaries in the input stream using the value of the property. The EOL property is especially useful with ASCII files. By setting it to , the incoming ASCII text stream can be split into lines. In this case, one event is fired for each line received (as well as in packet boundaries). The . bytes are discarded. The EOL property is a binary string. This means that it can be more than one byte long, and it can contain NULL bytes. |
IdleTimeout number |
This property contains the idle timeout for this connection. This property is similar to DefaultIdleTimeout but may be set on a per-connection basis to override DefaultIdleTimeout. This property specifies the idle timeout (in seconds) for the connected client. When set to a positive value, the class will disconnect idle clients after the specified timeout. This applies only to clients that have not sent to received data within the specified number of seconds. If set to 0 (default), no idle timeout is applied. Note: DoEvents must be called for the class to check existing connections. |
LocalAddress string |
This property shows the IP address of the interface through which the connection is passing. is important for multihomed hosts so that it can be used to find the particular network interface through which an individual connection is going. |
MaxLineLength number |
This property is the size of an internal buffer that holds received data while waiting for an string. If an string is found in the input stream before bytes are received, the DataIn event is fired with the EOL parameter set to True, and the buffer is reset. If no EOL is found, and bytes are accumulated in the buffer, the DataIn event is fired with the EOL parameter set to False, and the buffer is reset. The minimum value for is 256 bytes. The default value is 2048 bytes. |
ReadyToSend boolean |
This indicates whether the class is ready to send data. This property indicates that the underlying TCP/IP subsystem is ready to accept data. This is True after a client connects but will become False after a failed . After a failed , the ReadyToSend event will fire and this property will be True when data can be sent again. |
RecordLength number |
If set to a positive value, this setting defines the length of the data records to be received. The class will accumulate data until RecordLength is reached and only then will fire the DataIn event with the data of length RecordLength. This allows data to be received as records of known length. This value can be changed at any time, including within the DataIn event. A value of 0 (default) means this setting is not used. Note: It is recommended to use the ChangeRecordLength method instead of setting this property. |
RemoteHost string |
This property shows the IP address of the remote host through which the connection is coming. The connection must be valid or an error will be fired. If the class is configured to use a SOCKS firewall, the value assigned to this property may be preceded with an "*". If this is the case, the host name is passed to the firewall unresolved and the firewall performs the DNS resolution. |
RemotePort number |
This property shows the Transmission Control Protocol (TCP) port on the remote host through which the connection is coming. The connection must be valid or an error will be fired. |
SingleLineMode boolean |
This property shows the special mode for line-oriented protocols. When SingleLineMode is True, the class treats the incoming data stream as lines separated by carriage return (CR), line feed (LF), or CRLF. The EOL property is ignored. |
Timeout number |
This property specifies a timeout for the class. If the property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately. If is set to a positive value, data is sent in a blocking manner and the class will wait for the operation to complete before returning control. The class will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of seconds. The class will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not "freeze" and remains responsive. If Timeout expires, and the operation is not yet complete, the class . Please note that by default, all timeouts are inactivity timeouts, i.e. the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received. The default value for the property is 0 (asynchronous operation). |
UserData Uint8Array |
The property holds connection-specific user-specified data. User-specified data may be set or retrieved at any point while the connection is valid. This provides a simple way to associate arbitrary data with a specific connection. |
UserDataB byte[] |
The property holds connection-specific user-specified data. User-specified data may be set or retrieved at any point while the connection is valid. This provides a simple way to associate arbitrary data with a specific connection. |
Constructors
public Connection();
Config Settings (class ipworks.tcpserver)
The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.TCPServer Config Settings | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
AllowedClients:
A comma-separated list of host names or IP addresses that can access the class.This configuration setting defines a comma-separated list of host names or IPv4 addresses that may access the class.
The wildcard character "*" is supported. The default value is "*" and all connections are accepted.
When a client connects, the client's address is checked against the list defined here. If there is no match, the ConnectionRequest event fires with an Accept value set to False. If no action is taken within the ConnectionRequest event, the client will be disconnected. |
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BindExclusively: Whether or not the component considers a local port reserved for exclusive use.If this is True (default), the component will bind to the local port with the ExclusiveAddressUse option set, meaning that nothing else can bind to the same port. Also the component will not be able to bind to local ports that are already in use by some other instance, and attempts to do so will result in failure. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
BlockedClients:
A comma-separated list of host names or IP addresses that cannot access the class.This configuration setting defines a comma-separated list of host names or IPv4 addresses that cannot access the class.The default value is "" and all connections are accepted.
When a client connects, the client's address is checked against the list defined here. If there is a match, the ConnectionRequest event fires with an Accept value set to False. If no action is taken within the ConnectionRequest event, the client will not be connected. |
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DefaultConnectionTimeout:
The inactivity timeout applied to the SSL handshake.This configuration setting specifies the inactivity (in seconds) to apply to incoming Secure Sockets Layer (SSL) connections. When set to a positive value,
if the other end is unresponsive for the specified number of seconds, the connection will timeout. This is not applicable
to the entire handshake. It is applicable only to the inactivity of the connecting client during the handshake if a response is expected
and none is received within the timeout window. The default value is 0, and no connection-specific timeout is applied.
Note: This is applicable only to incoming SSL connections. This should be set only if there is a specific reason to do so. |
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InBufferSize:
The size in bytes of the incoming queue of the socket.
This is the size of an internal queue in the Transmission Control Protocol (TCP)/IP stack.
You can increase or decrease its size depending on the amount
of data that you will be receiving. Increasing the value of the
InBufferSize setting can provide significant improvements in
performance in some cases.
Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated, the InBufferSize reverts to its defined size. The same thing will happen if you attempt to make it too large or too small. InBufferSize is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified. |
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KeepAliveInterval:
The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received.A TCP keep-alive packet will be sent after a period of inactivity, as
defined by KeepAliveTime. If no acknowledgment is received from the remote host, the keep-alive packet
will be sent again. This setting specifies the interval at which the successive keep-alive packets are sent in milliseconds.
If this value is not specified here, the system default is 1 second.
This setting is applicable to all connections.
Note: This value is not applicable in macOS. |
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KeepAliveTime: The inactivity time in milliseconds before a TCP keep-alive packet is sent.By default, the operating system will determine the time a connection is idle before a TCP keep-alive packet is sent. If this value is not specified here, the system default is 2 hours. In many cases, a shorter interval is more useful. Set this value to the desired interval in milliseconds. This setting is applicable to all connections. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
MaxConnections:
The maximum number of connections available.
This is the maximum number of connections available. This property must be set before Listening is set
to True, and once set, it can no longer be changed for the current instance of the class.
The maximum value for this setting is 100,000 connections.
Use this setting with caution. Extremely large values may affect performance.
The default value is 1000.
Note: Unix/Linux operating systems limit the number of simultaneous connections to 1024. |
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OutBufferSize:
The size in bytes of the outgoing queue of the socket.This is the size of an internal queue in the TCP/IP stack.
You can increase or decrease its size depending on the amount
of data that you will be sending. Increasing the value of the
OutBufferSize setting can provide significant improvements in
performance in some cases.
Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the OutBufferSize reverts to its defined size. The same thing will happen if you attempt to make it too large or too small. OutBufferSize is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified. |
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TcpNoDelay:
Whether or not to delay when sending packets.
When true, the socket will send all data that is ready to send at once. When
false, the socket will send smaller buffered packets of data at small intervals.
This is known as the Nagle algorithm.
By default, this config is set to false. |
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UseIPv6:
Whether to use IPv6.When set to 0 (default), the class will use IPv4 exclusively.
When set to 1, the class will use IPv6 exclusively. When set to 2, the class will listen for both IPv4 and IPv6 connections. If IPv6 is not available on the system, only IPv4 will be used. The default value is 0.
Possible values are as follows:
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SSL Config Settings | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
LogSSLPackets:
Controls whether SSL packets are logged when using the internal security API.When SSLProvider is set to Internal, this setting controls whether SSL packets should be logged. By default, this setting is False, as it is only useful for debugging purposes.
When enabled, SSL packet logs are output using the SSLStatus event, which will fire each time an SSL packet is sent or received. Enabling this setting has no effect if SSLProvider is set to Platform. |
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OpenSSLCADir:
The path to a directory containing CA certificates.This functionality is available only when the provider is OpenSSL.
The path set by this property should point to a directory containing CA certificates in PEM format. The files each contain one CA certificate. The files are looked up by the CA subject name hash value, which must hence be available. If more than one CA certificate with the same name hash value exist, the extension must be different (e.g. 9d66eef0.0, 9d66eef0.1 etc). OpenSSL recommends to use the c_rehash utility to create the necessary links. Please refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details. |
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OpenSSLCAFile:
Name of the file containing the list of CA's trusted by your application.This functionality is available only when the provider is OpenSSL.
The file set by this property should contain a list of CA certificates in PEM format. The file can contain several CA certificates identified by -----BEGIN CERTIFICATE----- ... (CA certificate in base64 encoding) ... -----END CERTIFICATE----- sequences. Before, between, and after the certificates text is allowed which can be used e.g. for descriptions of the certificates. Please refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details. |
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OpenSSLCipherList:
A string that controls the ciphers to be used by SSL.This functionality is available only when the provider is OpenSSL.
The format of this string is described in the OpenSSL man page ciphers(1) section "CIPHER LIST FORMAT". Please refer to it for details. The default string "DEFAULT" is determined at compile time and is normally equivalent to "ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH". |
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OpenSSLPrngSeedData:
The data to seed the pseudo random number generator (PRNG).This functionality is available only when the provider is OpenSSL.
By default OpenSSL uses the device file "/dev/urandom" to seed the PRNG and setting OpenSSLPrngSeedData is not required. If set, the string specified is used to seed the PRNG. |
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ReuseSSLSession:
Determines if the SSL session is reused.
If set to true, the class will reuse the context if and only if the following criteria are met:
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SSLAcceptAnyServerCert: Whether to trust any certificate presented by the server.This setting disables all certificate verification when set to True. This configuration setting must be enabled to trust a self-signed certificate. It is not recommended to enable this configuration setting in a production environment. The default value is False. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
SSLCACerts:
A newline separated list of CA certificate to use during SSL client authentication.This setting specifies one or more CA certificates to be included in the request when performing
SSL client authentication. Some servers require the entire chain, including CA certificates, to be presented
when performing SSL client authentication. The value of this setting is a newline (CrLf) separated list of certificates. For instance:
-----BEGIN CERTIFICATE----- MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw ... eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w F0I1XhM+pKj7FjDr+XNj -----END CERTIFICATE----- \r \n -----BEGIN CERTIFICATE----- MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp .. d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA -----END CERTIFICATE----- |
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SSLCipherStrength:
The minimum cipher strength used for bulk encryption.
This minimum cipher strength largely dependent on the security modules installed
on the system. If the cipher strength specified is not supported,
an error will be returned when connections are initiated.
Please note that this setting contains the minimum cipher strength requested from the security library. The actual cipher strength used for the connection is shown by the SSLStatus event. Use this setting with caution. Requesting a lower cipher strength than necessary could potentially cause serious security vulnerabilities in your application. When the provider is OpenSSL, SSLCipherStrength is currently not supported. This functionality is instead made available through the OpenSSLCipherList config setting. |
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SSLEnabledCipherSuites:
The cipher suite to be used in an SSL negotiation.The enabled cipher suites to be used in SSL negotiation.
By default, the enabled cipher suites will include all available ciphers ("*"). The special value "*" means that the class will pick all of the supported cipher suites. If SSLEnabledCipherSuites is set to any other value, only the specified cipher suites will be considered. Multiple cipher suites are separated by semicolons. Example values when SSLProvider is set to Platform:
obj.config("SSLEnabledCipherSuites=*");
obj.config("SSLEnabledCipherSuites=TLS_DHE_DSS_WITH_AES_128_CBC_SHA");
obj.config("SSLEnabledCipherSuites=TLS_DHE_DSS_WITH_AES_128_CBC_SHA;TLS_DH_ANON_WITH_AES_128_CBC_SHA");
Possible values when SSLProvider is set to Internal include:
When TLS 1.3 is negotiated (see SSLEnabledProtocols) only the following cipher suites are supported:
SSLEnabledCipherSuites is used together with SSLCipherStrength. |
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SSLEnabledProtocols:
Used to enable/disable the supported security protocols.Used to enable/disable the supported security protocols.
Not all supported protocols are enabled by default (the value of this setting is 4032). If you want more granular control over the enabled protocols, you can set this property to the binary 'OR' of one or more of the following values:
SSLEnabledProtocols - TLS 1.3 Notes In the JavaScript edition the platform implementation is used when TLS 1.3 is enabled and SSLEnabledCipherSuites and other similar SSL configuration settings are not supported. |
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SSLEnableRenegotiation:
Whether the renegotiation_info SSL extension is supported.This setting specifies whether the renegotiation_info SSL extension will be used in the request when using the internal security API.
This setting is true by default, but can be set to false to disable the extension.
This setting is only applicable when SSLProvider is set to Internal. |
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SSLIncludeCertChain:
Whether the entire certificate chain is included in the SSLServerAuthentication event.This setting specifies whether the Encoded parameter of the SSLServerAuthentication event contains
the full certificate chain. By default this value is False and only the leaf certificate will be present
in the Encoded parameter of the SSLServerAuthentication event.
If set to True all certificates returned by the server will be present in the Encoded parameter of the SSLServerAuthentication event. This includes the leaf certificate, any intermediate certificate, and the root certificate. |
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SSLKeyLogFile:
The location of a file where per-session secrets are written for debugging purposes.This setting optionally specifies the full path to a file on disk where per-session secrets are stored for debugging purposes.
When set, the class will save the session secrets in the same format as the SSLKEYLOGFILE environment variable functionality used by most major browsers and tools such as Chrome, Firefox, and cURL. This file can then be used in tools such as Wireshark to decrypt TLS traffice for debugging purposes. When writing to this file the class will only append, it will not overwrite previous values. Note: This setting is only applicable when SSLProvider is set to Internal. |
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SSLNegotiatedCipher:
Returns the negotiated ciphersuite.Returns the ciphersuite negotiated during the SSL handshake.
Note: For server components (e.g. TCPServer) this is a per-connection setting accessed by passing the ConnectionId. For example:
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SSLNegotiatedCipherStrength:
Returns the negotiated ciphersuite strength.Returns the strength of the ciphersuite negotiated during the SSL handshake.
Note: For server components (e.g.TCPServer) this is a per-connection setting accessed by passing the ConnectionId. For example:
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SSLNegotiatedCipherSuite:
Returns the negotiated ciphersuite.Returns the ciphersuite negotiated during the SSL handshake represented as a single string.
Note: For server components (e.g. TCPServer) this is a per-connection setting accessed by passing the ConnectionId. For example:
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SSLNegotiatedKeyExchange:
Returns the negotiated key exchange algorithm.Returns the key exchange algorithm negotiated during the SSL handshake.
Note: For server components (e.g. TCPServer) this is a per-connection setting accessed by passing the ConnectionId. For example:
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SSLNegotiatedKeyExchangeStrength:
Returns the negotiated key exchange algorithm strength.Returns the strenghth of the key exchange algorithm negotiated during the SSL handshake.
Note: For server components (e.g. TCPServer) this is a per-connection setting accessed by passing the ConnectionId. For example:
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SSLNegotiatedVersion:
Returns the negotiated protocol version.Returns the protocol version negotiated during the SSL handshake.
Note: For server components (e.g. TCPServer) this is a per-connection setting accessed by passing the ConnectionId. For example:
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SSLSecurityFlags:
Flags that control certificate verification.The following flags are defined (specified in hexadecimal
notation). They can be or-ed together to exclude multiple
conditions:
This functionality is currently not available when the provider is OpenSSL. |
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SSLServerCACerts:
A newline separated list of CA certificate to use during SSL server certificate validation.This setting optionally specifies one or more CA certificates to be used when verifying the server certificate. When verifying the server's certificate the certificates trusted by the system will be used as part of the verification process. If the server's CA certificates are not installed to the trusted system store, they may be specified here so they are included when performing the verification process. This setting should only be set if the server's CA certificates are not already trusted on the system and cannot be installed to the trusted system store.
The value of this setting is a newline (CrLf) separated list of certificates. For instance: -----BEGIN CERTIFICATE----- MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw ... eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w F0I1XhM+pKj7FjDr+XNj -----END CERTIFICATE----- \r \n -----BEGIN CERTIFICATE----- MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp .. d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA -----END CERTIFICATE----- |
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TLS12SignatureAlgorithms:
Defines the allowed TLS 1.2 signature algorithms when SSLProvider is set to Internal.This setting specifies the allowed server certificate signature algorithms when SSLProvider is set to Internal and SSLEnabledProtocols is set to allow TLS 1.2.
When specified the class will verify that the server certificate signature algorithm is among the values specified in this setting. If the server certificate signature algorithm is unsupported the class . The format of this value is a comma separated list of hash-signature combinations. For instance:
In order to not restrict the server's certificate signature algorithm, specify an empty string as the value for this setting, which will cause the signature_algorithms TLS 1.2 extension to not be sent. |
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TLS12SupportedGroups:
The supported groups for ECC.This setting specifies a comma separated list of named groups used in TLS 1.2 for ECC.
The default value is ecdhe_secp256r1,ecdhe_secp384r1,ecdhe_secp521r1. When using TLS 1.2 and SSLProvider is set to Internal, the values refer to the supported groups for ECC. The following values are supported:
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TLS13KeyShareGroups:
The groups for which to pregenerate key shares.This setting specifies a comma separated list of named groups used in TLS 1.3 for key exchange.
The groups specified here will have key share data pregenerated locally before establishing a connection.
This can prevent an additional round trip during the handshake if the group is supported by the server.
The default value is set to balance common supported groups and the computational resources required to generate key shares. As a result only some groups are included by default in this setting. Note: All supported groups can always be used during the handshake even if not listed here, but if a group is used which is not present in this list it will incur an additional round trip and time to generate the key share for that group. In most cases this setting does not need to be modified. This should only be modified if there is a specific reason to do so. The default value is ecdhe_x25519,ecdhe_secp256r1,ecdhe_secp384r1,ffdhe_2048,ffdhe_3072 The values are ordered from most preferred to least preferred. The following values are supported:
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TLS13SignatureAlgorithms:
The allowed certificate signature algorithms.This setting holds a comma separated list of allowed signature algorithms. Possible values are:
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TLS13SupportedGroups:
The supported groups for (EC)DHE key exchange.This setting specifies a comma separated list of named groups used in TLS 1.3 for key exchange.
This setting should only be modified if there is a specific reason to do so.
The default value is ecdhe_x25519,ecdhe_x448,ecdhe_secp256r1,ecdhe_secp384r1,ecdhe_secp521r1,ffdhe_2048,ffdhe_3072,ffdhe_4096,ffdhe_6144,ffdhe_8192 The values are ordered from most preferred to least preferred. The following values are supported:
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BuildInfo: Information about the product's build.When queried, this setting will return a string containing information about the product's build. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CodePage:
The system code page used for Unicode to Multibyte translations.The default code page is Unicode UTF-8 (65001).
The following is a list of valid code page identifiers:
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LicenseInfo:
Information about the current license.When queried, this setting will return a string containing information about the license this instance of a class is using. It will return the following information:
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MaskSensitive:
Whether sensitive data is masked in log messages.In certain circumstances it may be beneficial to mask sensitive data, like passwords, in log messages. Set this to true to mask sensitive data. The default is false.
This setting only works on these classes: AS3Receiver, AS3Sender, Atom, Client(3DS), FTP, FTPServer, IMAP, OFTPClient, SSHClient, SCP, Server(3DS), Sexec, SFTP, SFTPServer, SSHServer, TCPClient, TCPServer. |
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UseInternalSecurityAPI:
Tells the class whether or not to use the system security libraries or an internal implementation.
When set to false, the class will use the system security libraries by default to perform cryptographic functions where applicable.
Setting this setting to true tells the class to use the internal implementation instead of using the system security libraries. This setting is set to false by default on all platforms. |
Trappable Errors (class ipworks.tcpserver)
TCPServer Errors
100 You cannot change the RemotePort at this time. A connection is in progress. | |
101 You cannot change the RemoteHost at this time. A connection is in progress. | |
102 The RemoteHost address is invalid (0.0.0.0). | |
104 TCPServer is already listening. | |
106 Cannot change LocalPort when TCPServer is listening. | |
107 Cannot change LocalHost when TCPServer is listening. | |
108 Cannot change MaxConnections when TCPServer is listening. | |
112 You cannot change MaxLineLength at this time. A connection is in progress. | |
116 RemotePort cannot be zero. Please specify a valid service port number. | |
126 Invalid ConnectionId. | |
135 Operation would block. |
SSL Errors
270 Cannot load specified security library. | |
271 Cannot open certificate store. | |
272 Cannot find specified certificate. | |
273 Cannot acquire security credentials. | |
274 Cannot find certificate chain. | |
275 Cannot verify certificate chain. | |
276 Error during handshake. | |
280 Error verifying certificate. | |
281 Could not find client certificate. | |
282 Could not find server certificate. | |
283 Error encrypting data. | |
284 Error decrypting data. |
TCP/IP Errors
10004 [10004] Interrupted system call. | |
10009 [10009] Bad file number. | |
10013 [10013] Access denied. | |
10014 [10014] Bad address. | |
10022 [10022] Invalid argument. | |
10024 [10024] Too many open files. | |
10035 [10035] Operation would block. | |
10036 [10036] Operation now in progress. | |
10037 [10037] Operation already in progress. | |
10038 [10038] Socket operation on non-socket. | |
10039 [10039] Destination address required. | |
10040 [10040] Message too long. | |
10041 [10041] Protocol wrong type for socket. | |
10042 [10042] Bad protocol option. | |
10043 [10043] Protocol not supported. | |
10044 [10044] Socket type not supported. | |
10045 [10045] Operation not supported on socket. | |
10046 [10046] Protocol family not supported. | |
10047 [10047] Address family not supported by protocol family. | |
10048 [10048] Address already in use. | |
10049 [10049] Can't assign requested address. | |
10050 [10050] Network is down. | |
10051 [10051] Network is unreachable. | |
10052 [10052] Net dropped connection or reset. | |
10053 [10053] Software caused connection abort. | |
10054 [10054] Connection reset by peer. | |
10055 [10055] No buffer space available. | |
10056 [10056] Socket is already connected. | |
10057 [10057] Socket is not connected. | |
10058 [10058] Can't send after socket shutdown. | |
10059 [10059] Too many references, can't splice. | |
10060 [10060] Connection timed out. | |
10061 [10061] Connection refused. | |
10062 [10062] Too many levels of symbolic links. | |
10063 [10063] File name too long. | |
10064 [10064] Host is down. | |
10065 [10065] No route to host. | |
10066 [10066] Directory not empty | |
10067 [10067] Too many processes. | |
10068 [10068] Too many users. | |
10069 [10069] Disc Quota Exceeded. | |
10070 [10070] Stale NFS file handle. | |
10071 [10071] Too many levels of remote in path. | |
10091 [10091] Network subsystem is unavailable. | |
10092 [10092] WINSOCK DLL Version out of range. | |
10093 [10093] Winsock not loaded yet. | |
11001 [11001] Host not found. | |
11002 [11002] Non-authoritative 'Host not found' (try again or check DNS setup). | |
11003 [11003] Non-recoverable errors: FORMERR, REFUSED, NOTIMP. | |
11004 [11004] Valid name, no data record (check DNS setup). |