CCC FTP command

11/14/2018 3:23 PM

11/14/2018 3:23 PM

This article describes the use of the Clear Command Channel (CCC) FTP command.

Serv-U Managed File Transfer & Serv-U FTP Server

The CCC command is useful on client's requiring the usage of active (PORT) mode data transfers when they are behind a router that implements NAT. This command allows NAT to function on the router so that it can continue to "follow" the FTP transaction and alter the PORT command with an external IP address while preparing for the server's inbound connection on the port specified in that PORT command.

Common responses

• 200 FTP response code
• 421 FTP response code
• 500 FTP response code , 502 FTP response code , 533 FTP response code , 534 FTP response code

See also

• AUTH FTP command
• PROT FTP command