Hi all, I have configured my INternet Gateway using ipchains by implementing the MASQ connection on some defined port in order to enable the internet connection for my client. Finally, I got this bellow message: ftp> ls -l 502 Illegal PORT Command 150 Opening ASCII mode data connection for directory listing. How can it be like that ? Login was successfull, but I permitted nothing to run the command. Can you help me ? Browsing, receiving and sending mail, etc are working fine. Except this one, using ftp. For FTP Setting , this is my ipchains settings : # FTP ipchains -I forward -s 192.168.21.0/24 -d 0/0 20 -j MASQ -p tcp ipchains -I forward -s 192.168.21.0/24 -d 0/0 20 -j MASQ -p udp ipchains -I forward -s 192.168.21.0/24 -d 0/0 21 -j MASQ -p tcp ipchains -I forward -s 192.168.21.0/24 -d 0/0 21 -j MASQ -p udp ipchains -I forward -s 192.168.21.0/24 -d 0/0 69 -j MASQ -p tcp ipchains -I forward -s 192.168.21.0/24 -d 0/0 69 -j MASQ -p udp ipchains -I forward -s 192.168.21.0/24 -d 0/0 115 -j MASQ -p tcp ipchains -I forward -s 192.168.21.0/24 -d 0/0 115 -j MASQ -p udp ipchains -I forward -s 192.168.21.0/24 -d 0/0 2431 -j MASQ -p tcp ipchains -I forward -s 192.168.21.0/24 -d 0/0 2431 -j MASQ -p udp Thanks. Aramico