Hello, there is an NT FTP server with private IP (192.168.0.240) behind a Debian, and on the Debian the port 90 is forwarded to the nt's port 21 with redir. If I try to connect to the Debian's port 90, I get connected to the NT, but if my ftp client tries to download something or even do a directory listing, the nt's ftp servers says: 'invalid port command'.
So, the server (the NT) is masquaraded, not the client, that's why I use PORT instead of PASV. My FTP client (Internet) --> Debian (masq firewall) --> NT FTP server (private IP) Cmd: PORT 63,112,201,195,4,136 500: Invalid PORT Command. Does someone know, what to do in this case? The ftp server is Microsoft FTP Service (Version 5.0). Thanks, Gabor
