The client issued a command name command to the FTP server. The FTP server implements the command name command, but is configured to reject it.
The command is rejected. Control is returned to the client connection for further command processing.
Report the error to the FTP server installation system programmer.
If you want your FTP server to support command name, add statements to FTP.DATA to enable this support. See the z/OS Communications Server: IP Configuration Reference for information on enabling command name support for your FTP server.