PASV

Force the server into passive mode when establishing data connections. This will cause SecureFX to actively create any data connections rather than passively listen for data connections from the server. This option is sometimes needed where the client
A computer or application that uses services provided by a server. machine resides on a network whose firewall will not allow incoming connections from external servers.

The options for using this command can be found in both the Session Options/Connection/FTP and the Global Options/File TransferFTP dialogs.