What is the command syntax for connecting to an FTP site with a port number. Let's say, anonymous, 25.50.50.190 under port 6666.

The DOS FTP Client was not designed to do such a thing I believe so it does not have that functionality. It is suggested that you use a more friendly FTP client tool to access different ports. You can use the IE Browser: ftp://mymachine:PORT OR Use another more advanced tool like WS_FTP Reason is that Port 20 and 21 are ALWAYS used for FTP and even when you start it on another port the transition to that port is made in with PORT command by these more advanced tools after establishing connection on default ports.... Here is quote from RFC: http://rfc.net/rfc959.html "DATA CONNECTION MANAGEMENT Default Data Connection Ports: All FTP implementations must support use of the default data connection ports, and only the User-PI may initiate the use of non-default ports. Negotiating Non-Default Data Ports: The User-PI may specify a non-default user side data port with the PORT command. The User-PI may request the server side to identify a non-default server side data port with the PASV command. Since a connection is defined by the pair of addresses, either of these actions is enough to get a different data connection, still it is permitted to do both commands to use new ports on both ends of the data connection. "