Most servers have an "idle time" value that specifies how long a user's session can last when no activity is detected. When the user exceeds the time limit, the server connection is closed. To prevent the server from closing the connection due to inactivity, you can configure the FTP Client to send "keep alive" commands.
To preserve a connection to the server
Open thedialog box and then click the tab.
Selectand specify how many seconds to wait in between sending consecutive keep alive (NOOP) commands.
NOTE:This setting has no effect on SFTP connections. For SFTP connections useon the tab of the dialog box.