Use the WebAdmin Interface to configure the FTP module. Open the Access page in the Settings realm.
Log: Use this setting to specify what kind of information the FTP module should put in the Server Log. Usually you should use the Major (password modification reports) or Problems (non-fatal errors) levels. But when you experience problems with the FTP module, you may want to set the Log Level setting to Low-Level or All Info: in this case protocol-level or link-level details will be recorded in the System Log as well. Most FTP clients send passwords in the clear text format, and setting the Log setting to these values for long periods of time can become a security hole if the Log file can be copied from the Server computer.
The FTP module records in the System Log are marked with the FTP tag.
Channels: When you specify a non-zero value for the TCP/IP Channels setting, the FTP module creates a so-called "listener" on the specified port(s). The module starts to accept FTP connections from FTP clients. This setting is used to limit the number of simultaneous connections the FTP module can accept. If there are too many incoming connections open, the module will reject new connections, and the users should retry later.
If the number of channels is set to zero, the FTP module closes the listener and releases (unbinds from) the TCP port(s).
Listener: By default, the FTP module Listener accepts clear text connections on the TCP port 8021. Follow the listener link to tune the FTP Listener. If the server computer does not have any other FTP server software running, you may want to switch the FTP Listener to the port 21 (the standard FTP port). Note:: The FTP protocol has a "NAT traversal" problem. When working in the "active" mode, the FTP server needs to open data connections to the client computer, and if there is a NAT device between the FTP server and the client computer, attempts to establish these data connections would fail. To solve this problem, most NAT devices/programs implement an FTP proxy, but they activate this feature only if they detect an outgoing connection to the port 21.
If you use the FTP module with a non-standard port number (such as 8021), your users connecting from behind NAT devices won't be able to do data transfers in the "active" mode (the "passive" mode should work correctly).
Passive Mode: When this option is disabled, the FTP module rejects requests for passive-mode file transfers.
Send WAN Address: Use this option to send the Server or Cluster WAN Addresses when a client requests a Passive Mode transfer.
Use Fixed Active Port: If this option is enabled, the FTP module uses the fix TCP port number for active (outgoing) data connections. That port number is the port number the FTP control connection is accepted on minus 1.
If this option is disabled, the FTP module selects the TCP port for active (outgoing) data connections from the TCP p