# NetClock Component

The NetClock component provides the current time in Greenwich Mean Time from an Internet Time Server.

## Syntax

```text
nsoftware.IPWorks.NetClock
```

## Remarks

The NetClock component implements a standard Time Protocol client as specified in RFC 868, as well as an SNTP (Simple Network Time Protocol).

The address of the Time Server is provided in the [TimeServer](#timeserver-property-netclock-component) property. You get the time by calling the [GetTime](#gettime-method-netclock-component) method.

The component also allows you to synchronize your system time with that of the [TimeServer](#timeserver-property-netclock-component). This is done through the [GetAndSetTime](#getandsettime-method-netclock-component) method. Calling [GetAndSetTime](#getandsettime-method-netclock-component) will request the time from the server and then set the system clock to match it.

## Property List

*The following is the full list of the properties of the component with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Idle](#idle-property-netclock-component) | The current status of the component. |
| [LocalHost](#localhost-property-netclock-component) | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
| [LocalTime](#localtime-property-netclock-component) | This property includes the time returned by the [TimeServer](#timeserver-property-netclock-component) converted to local time. |
| [Protocol](#protocol-property-netclock-component) | This property is the protocol used by the component. |
| [ServerTime](#servertime-property-netclock-component) | This property includes the time returned by the [TimeServer](#timeserver-property-netclock-component) . |
| [Timeout](#timeout-property-netclock-component) | The timeout for the component. |
| [TimePort](#timeport-property-netclock-component) | This property includes the User Datagram Protocol (UDP) port where the remote time server is listening. |
| [TimeServer](#timeserver-property-netclock-component) | This property includes the time server from which to request the time. |

## Method List

*The following is the full list of the methods of the component with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Config](#config-method-netclock-component) | Sets or retrieves a configuration setting. |
| [DoEvents](#doevents-method-netclock-component) | This method processes events from the internal message queue. |
| [GetAndSetTime](#getandsettime-method-netclock-component) | This method is the same as the [GetTime](#gettime-method-netclock-component) method, but the system clock is also set to the received time. |
| [GetTime](#gettime-method-netclock-component) | This method sends a time request to the [TimeServer](#timeserver-property-netclock-component) to get the current time. |
| [Interrupt](#interrupt-method-netclock-component) | This method interrupts the current method. |
| [Reset](#reset-method-netclock-component) | This method resets the component. |

## Event List

*The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Error](#error-event-netclock-component) | Fired when information is available about errors during data delivery. |

## Config Settings

*The following is a list of config settings for the component with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [CaptureIPPacketInfo](#CaptureIPPacketInfo) | Used to capture the packet information. |
| [DelayHostResolution](#DelayHostResolution) | Whether the hostname is resolved when RemoteHost is set. |
| [DestinationAddress](#DestinationAddress) | Used to get the destination address from the packet information. |
| [DontFragment](#DontFragment) | Used to set the Don't Fragment flag of outgoing packets. |
| [LocalHost](#LocalHost) | The name of the local host through which connections are initiated or accepted. |
| [LocalPort](#LocalPort) | The port in the local host where the component binds. |
| [MaxPacketSize](#MaxPacketSize) | The maximum length of the packets that can be received. |
| [QOSDSCPValue](#QOSDSCPValue) | Used to specify an arbitrary QOS/DSCP setting (optional). |
| [QOSTrafficType](#QOSTrafficType) | Used to specify QOS/DSCP settings (optional). |
| [ShareLocalPort](#ShareLocalPort) | If set to True, allows more than one instance of the component to be active on the same local port. |
| [UseConnection](#UseConnection) | Determines whether to use a connected socket. |
| [UseIPv6](#UseIPv6) | Whether or not to use IPv6. |
| [AbsoluteTimeout](#AbsoluteTimeout) | Determines whether timeouts are inactivity timeouts or absolute timeouts. |
| [FirewallData](#FirewallData) | Used to send extra data to the firewall. |
| [InBufferSize](#InBufferSize) | The size in bytes of the incoming queue of the socket. |
| [OutBufferSize](#OutBufferSize) | The size in bytes of the outgoing queue of the socket. |
| [BuildInfo](#BuildInfo) | Information about the product's build. |
| [GUIAvailable](#GUIAvailable) | Whether or not a message loop is available for processing events. |
| [LicenseInfo](#LicenseInfo) | Information about the current license. |
| [MaskSensitiveData](#MaskSensitiveData) | Whether sensitive data is masked in log messages. |
| [UseInternalSecurityAPI](#UseInternalSecurityAPI) | Whether or not to use the system security libraries or an internal implementation. |

# Idle Property ([NetClock](#netclock-component) Component)

The current status of the component.

## Syntax

```text
public bool Idle { get; }
```

## Default Value

True

## Remarks

This property will be False if the component is currently busy (communicating or waiting for an answer), and True at all other times.

This property is read-only.

# LocalHost Property ([NetClock](#netclock-component) Component)

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

## Syntax

```text
public string LocalHost { get; set; }
```

## Default Value

""

## Remarks

This 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 multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the component initiate connections (or accept in the case of server components) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used.

If the component 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 multihomed 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.

# LocalTime Property ([NetClock](#netclock-component) Component)

This property includes the time returned by the [TimeServer](#timeserver-property-netclock-component) converted to local time.

## Syntax

```text
public string LocalTime { get; }
```

## Default Value

""

## Remarks

The server provides Greenwich Mean Time (GMT). This property contains the corresponding local time formatted as "MM/DD/YYYY HH:MM:SS" (where "HH" is in 24-hour format).

This property is read-only and not available at design time.

# Protocol Property ([NetClock](#netclock-component) Component)

This property is the protocol used by the component.

## Syntax

```text
public NetClockProtocols Protocol { get; set; }
enum NetClockProtocols {
  tpTime,
  tpSNTP
}
```

## Default Value

1

## Remarks

This property is the protocol used by the component. This property is used to specify which protocol the component will use to connect to the server. By default, this property is tpSNTP (1). The Time Protocol may be selected by setting this property to tpTimeProtocol (0).

# ServerTime Property ([NetClock](#netclock-component) Component)

This property includes the time returned by the [TimeServer](#timeserver-property-netclock-component) .

## Syntax

```text
public string ServerTime { get; }
```

## Default Value

""

## Remarks

This property contains the time returned by the [TimeServer](#timeserver-property-netclock-component). The time is given in Greenwich Mean Time (GMT) and is formatted as "MM/DD/YYYY HH:MM:SS GMT" (where "HH" is in 24-hour format).

For the corresponding local time, please consult the [LocalTime](#localtime-property-netclock-component) property.

This property is read-only and not available at design time.

# Timeout Property ([NetClock](#netclock-component) Component)

The timeout for the component.

## Syntax

```text
public int Timeout { get; set; }
```

## Default Value

60

## Remarks

If the Timeout property is set to 0, all operations will run uninterrupted until successful completion or an error condition is encountered.

If Timeout is set to a positive value, the component will wait for the operation to complete before returning control.

The component will use [DoEvents](#doevents-method-netclock-component) 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 component throws an exception.

NOTE: By default, all timeouts are *inactivity timeouts*, that is, the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the Timeout property is 60 seconds.

# TimePort Property ([NetClock](#netclock-component) Component)

This property includes the User Datagram Protocol (UDP) port where the remote time server is listening.

## Syntax

```text
public int TimePort { get; set; }
```

## Default Value

123

## Remarks

This property is the UDP port on the [TimeServer](#timeserver-property-netclock-component) to which time requests are sent. If [Protocol](#protocol-property-netclock-component) is set to tpTimeProtocol, the component will set this property to 37.

This property is not available at design time.

# TimeServer Property ([NetClock](#netclock-component) Component)

This property includes the time server from which to request the time.

## Syntax

```text
public string TimeServer { get; set; }
```

## Default Value

"pool.ntp.org"

## Remarks

This property contains the time server from which to request the time. This property should be set to a valid internet address of a time server. The server will reply with its current time (in Greenwich Mean Time).

When [Protocol](#protocol-property-netclock-component) is set to SNTP another public server that may be used is "time.google.com".

Time requests are sent to port [TimePort](#timeport-property-netclock-component) on the TimeServer.

# Config Method ([NetClock](#netclock-component) Component)

Sets or retrieves a configuration setting.

## Syntax

```text
public string Config(string configurationString);

Async Version
public async Task<string> Config(string configurationString);
public async Task<string> Config(string configurationString, CancellationToken cancellationToken);
```

## Remarks

Config is a generic method available in every component. It is used to set and retrieve [configuration settings](#config-settings-netclock-component) for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, 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](#config-settings-netclock-component), you must call *Config("PROPERTY")*. The value will be returned as a string.

# DoEvents Method ([NetClock](#netclock-component) Component)

This method processes events from the internal message queue.

## Syntax

```text
public void DoEvents();

Async Version
public async Task DoEvents();
public async Task DoEvents(CancellationToken cancellationToken);
```

## Remarks

When DoEvents is called, the component processes any available events. If no events are available, it waits for a preset period of time, and then returns.

# GetAndSetTime Method ([NetClock](#netclock-component) Component)

This method is the same as the [GetTime](#gettime-method-netclock-component) method, but the system clock is also set to the received time.

## Syntax

```text
public void GetAndSetTime();

Async Version
public async Task GetAndSetTime();
public async Task GetAndSetTime(CancellationToken cancellationToken);
```

## Remarks

This method is similar to the [GetTime](#gettime-method-netclock-component) method, but the system clock is also set to the received time (adjusted for timezone differences).

# GetTime Method ([NetClock](#netclock-component) Component)

This method sends a time request to the [TimeServer](#timeserver-property-netclock-component) to get the current time.

## Syntax

```text
public void GetTime();

Async Version
public async Task GetTime();
public async Task GetTime(CancellationToken cancellationToken);
```

## Remarks

This method sends a time request to the [TimeServer](#timeserver-property-netclock-component) on port 37. The reply is provided in the [ServerTime](#servertime-property-netclock-component) property, and the equivalent local time is provided in the [LocalTime](#localtime-property-netclock-component) property.

# Interrupt Method ([NetClock](#netclock-component) Component)

This method interrupts the current method.

## Syntax

```text
public void Interrupt();

Async Version
public async Task Interrupt();
public async Task Interrupt(CancellationToken cancellationToken);
```

## Remarks

If there is no method in progress, Interrupt simply returns, doing nothing.

# Reset Method ([NetClock](#netclock-component) Component)

This method resets the component.

## Syntax

```text
public void Reset();

Async Version
public async Task Reset();
public async Task Reset(CancellationToken cancellationToken);
```

## Remarks

This method will reset the component's properties to their default values.

# Error Event ([NetClock](#netclock-component) Component)

Fired when information is available about errors during data delivery.

## Syntax

```text
public event OnErrorHandler OnError;

public delegate void OnErrorHandler(object sender, NetClockErrorEventArgs e);

public class NetClockErrorEventArgs : EventArgs {
  public int ErrorCode { get; }
  public string Description { get; }
}
```

## Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component throws an exception.

The *ErrorCode* parameter contains an error code, and the *Description* parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the [Error Codes](#trappable-errors-netclock-component) section.

# Config Settings ([NetClock](#netclock-component) Component)

 The component 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 component, access to these *internal properties* is provided through the [Config](#config-method-netclock-component) method.

### UDP Config Settings

**CaptureIPPacketInfo**: Used to capture the packet information.If this is set to True, the component will capture the IP packet information.

The default value for this setting is False.

NOTE: This configuration setting is available only in Windows.

**DelayHostResolution**: Whether the hostname is resolved when RemoteHost is set.This configuration setting specifies whether a hostname is resolved immediately when RemoteHost is set. If *true* the component will resolve the hostname and the IP address will be present in the RemoteHost property. If *false*, the hostname is not resolved until needed by the component when a method to connect or send data is called. If desired, ResolveRemoteHost may be called to manually resolve the value in RemoteHost at any time.

The default value is *false* for the default library and *true* for the async library.

**DestinationAddress**: Used to get the destination address from the packet information.If [CaptureIPPacketInfo](#CaptureIPPacketInfo) is set to True, then this will be populated with the packet's destination address when a packet is received. This information will be accessible in the DataIn event.

NOTE: This configuration setting is available only in Windows.

**DontFragment**: Used to set the Don't Fragment flag of outgoing packets.When set to True, packets sent by the component will have the Don't Fragment flag set. The default value is False.

**LocalHost**: The name of the local host through which connections are initiated or accepted. The [LocalHost](#localhost-property-netclock-component) setting 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 multihomed hosts (machines with more than one IP interface), setting LocalHost to the value of an interface will make the component initiate connections (or accept in the case of server components) only through that interface.

If the component is connected, the [LocalHost](#localhost-property-netclock-component) setting 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 multihomed hosts (machines with more than one IP interface).

**LocalPort**: The port in the local host where the component binds. This configuration setting must be set before a connection is attempted. It instructs the component to bind to a specific port (or communication endpoint) in the local machine.

Setting this to 0 (default) enables the system to choose a port at random. The chosen port will be shown by LocalPort after the connection is established.

LocalPort cannot be changed once a connection is made. Any attempt to set this when a connection is active will generate an error.

This configuration setting is useful when trying to connect to services that require a trusted port on the client side. An example is the remote shell (rsh) service in UNIX systems.

**MaxPacketSize**: The maximum length of the packets that can be received.This configuration setting specifies the maximum size of the datagrams that the component will accept without truncation.

**QOSDSCPValue**: Used to specify an arbitrary QOS/DSCP setting (optional).[UseConnection](#UseConnection) must be True to use this configuration setting. This option allows you to specify an arbitrary DSCP value between 0 and 63. The default is 0. When set to the default value, the component will not set a DSCP value.

NOTE: This configuration setting uses the qWAVE API and is available only on Windows 7, Windows Server 2008 R2, and later.

**QOSTrafficType**: Used to specify QOS/DSCP settings (optional).[UseConnection](#UseConnection) must be True to use this setting. You may specify either the text or integer values: BestEffort (0), Background (1), ExcellentEffort (2), AudioVideo (3), Voice (4), and Control (5).

NOTE: This configuration setting uses the qWAVE API and is available only on Windows Vista and Windows Server 2008 or above.

NOTE: QOSTrafficType must be set before setting Active to True.

**ShareLocalPort**: If set to True, allows more than one instance of the component to be active on the same local port.This option must be set before the component is activated through the Active property or it will have no effect.

The default value for this setting is False.

**UseConnection**: Determines whether to use a connected socket.[UseConnection](#UseConnection) specifies whether or not the component should use a connected socket. The connection is defined as an association in between the local address/port and the remote address/port. As such, this is not a connection in the traditional Transmission Control Protocol (TCP) sense. It means only that the component will send and receive data to and from the specified destination.

The default value for this setting is False.

**UseIPv6**: Whether or not to use IPv6.By default, the component expects an IPv4 address for local and remote host properties, and it will create an IPv4 socket. To use IPv6 instead, set this to True.

### Socket Config Settings

**AbsoluteTimeout**: Determines whether timeouts are inactivity timeouts or absolute timeouts.If [AbsoluteTimeout](#AbsoluteTimeout) is set to True, any method that does not complete within [Timeout](#timeout-property-netclock-component) seconds will be aborted. By default, *AbsoluteTimeout* is False, and the timeout is an inactivity timeout.

NOTE: This option is not valid for User Datagram Protocol (UDP) ports.

**FirewallData**: Used to send extra data to the firewall.When the firewall is a tunneling proxy, use this property to send custom (additional) headers to the firewall (e.g., headers for custom authentication schemes).

**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. In some cases, increasing the value of the *InBufferSize* setting can provide significant improvements in performance.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the component is activated the *InBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small.

**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. In some cases, increasing the value of the *OutBufferSize* setting can provide significant improvements in performance.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the component is activated the *OutBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small.

### Base Config Settings

**BuildInfo**: Information about the product's build.When queried, this setting will return a string containing information about the product's build.

**GUIAvailable**: Whether or not a message loop is available for processing events.In a GUI-based application, long-running blocking operations may cause the application to stop responding to input until the operation returns. The component will attempt to discover whether or not the application has a message loop and, if one is discovered, it will process events in that message loop during any such blocking operation.

In some non-GUI applications, an invalid message loop may be discovered that will result in errant behavior. In these cases, setting [GUIAvailable](#GUIAvailable) to *false* will ensure that the component does not attempt to process external events.

**LicenseInfo**: Information about the current license.When queried, this setting will return a string containing information about the license this instance of a component is using. It will return the following information:

- Product: The product the license is for.
- Product Key: The key the license was generated from.
- License Source: Where the license was found (e.g., RuntimeLicense, License File).
- License Type: The type of license installed (e.g., Royalty Free, Single Server).
- Last Valid Build: The last valid build number for which the license will work.

**MaskSensitiveData**: 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 *true*.

**UseInternalSecurityAPI**: Whether or not to use the system security libraries or an internal implementation. When set to *false*, the component will use the system security libraries by default to perform cryptographic functions where applicable. In this case, calls to unmanaged code will be made. In certain environments, this is not desirable. To use a completely managed security implementation, set this setting to *true*.

Setting this configuration setting to *true* tells the component to use the internal implementation instead of using the system security libraries.

 On Windows, this setting is set to *false* by default. On Linux/macOS, this setting is set to *true* by default.

NOTE: This setting is static. The value set is applicable to all components used in the application.

When this value is set, the product's system dynamic link library (DLL) is no longer required as a reference, as all unmanaged code is stored in that file.

# Trappable Errors ([NetClock](#netclock-component) Component)

### NetClock Errors

|  |  |
| --- | --- |
| 119 | Error setting system time. |
| 301 | Timeout while waiting for the server. |
| 305 | An error occurred trying to change the system time. |
| 1000 | Control is busy performing current action. |

The component may also return one of the following error codes, which are inherited from other components.

### UDP Errors

|  |  |
| --- | --- |
| 104 | UDP is already Active. |
| 106 | You cannot change the LocalPort while the component is Active. |
| 107 | You cannot change the [LocalHost](#localhost-property-netclock-component) at this time. A connection is in progress. |
| 109 | The component must be Active for this operation. |
| 112 | You cannot change [MaxPacketSize](#MaxPacketSize) while the component is Active. |
| 113 | You cannot change [ShareLocalPort](#ShareLocalPort) option while the component is Active. |
| 114 | You cannot change RemoteHost when [UseConnection](#UseConnection) is set and the component Active. |
| 115 | You cannot change RemotePort when [UseConnection](#UseConnection) is set and the component is Active. |
| 116 | RemotePort cannot be zero when [UseConnection](#UseConnection) is set. Please specify a valid service port number. |
| 117 | You cannot change [UseConnection](#UseConnection) while the component is Active. |
| 118 | Message cannot be longer than [MaxPacketSize](#MaxPacketSize). |
| 119 | Message too short. |
| 434 | Unable to convert string to selected CodePage. |

### 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 nonsocket. |
| 10039 | [10039] Destination address required. |
| 10040 | [10040] Message is too long. |
| 10041 | [10041] Protocol wrong type for socket. |
| 10042 | [10042] Bad protocol option. |
| 10043 | [10043] Protocol is not supported. |
| 10044 | [10044] Socket type is not supported. |
| 10045 | [10045] Operation is not supported on socket. |
| 10046 | [10046] Protocol family is not supported. |
| 10047 | [10047] Address family is not supported by protocol family. |
| 10048 | [10048] Address already in use. |
| 10049 | [10049] Cannot 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] Cannot send after socket shutdown. |
| 10059 | [10059] Too many references, cannot splice. |
| 10060 | [10060] Connection timed out. |
| 10061 | [10061] Connection refused. |
| 10062 | [10062] Too many levels of symbolic links. |
| 10063 | [10063] File name is too long. |
| 10064 | [10064] Host is down. |
| 10065 | [10065] No route to host. |
| 10066 | [10066] Directory is 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 is not loaded yet. |
| 11001 | [11001] Host not found. |
| 11002 | [11002] Nonauthoritative 'Host not found' (try again or check DNS setup). |
| 11003 | [11003] Nonrecoverable errors: FORMERR, REFUSED, NOTIMP. |
| 11004 | [11004] Valid name, no data record (check DNS setup). |