KB Article #165747
The FTP command "CCC"
Problem
-- Is the FTP command CCC (Clear Command Channel) supported by Gateway and Secure Relay?
Resolution
* The FTP command "CCC" (defined in RFC 2228) is not currently supported in Gateway nor Secure Relay, either as a responder (server) or initiator (client). You will therefore need to make sure that the appropriate ports (for the data connection) are open on your firewall.