Controls whether to direct the server into passive mode. Recommended if behind a firewall.
When false, FTP communications take place in Active mode. In an Active mode connection, data connections are established from server to client on an IP address and port specified by the client in a PORT command to the server.
Many firewalls will not allow the FTP server to open a connection from outside to the higher ports where the FTP client adapter expects them. By default, Passive is set to TRUE, and the adapter will request that FTP communications take place in Passive mode. In Passive mode, the adapter will use the PASV instead of the PORT command and data connections will be established from the client to the server.