Hi! Well, I wil try to explain my problem the best I can (no englslih speaker). I'm trying to put a server behind my tomato router. This is Gene6FTP. If I use port 21, I can connect via PORT and PASV with no problem from WAN, just with a port mapping of 21 (and maybe 50000-50010). But… if I try to user a diferent port (2121), I just can connect via PASV method, and not all the clients work well with it. I have already configured PASV ports 50000-50010 in the server, and mapped them on tomato. I can't understand why I can connect perfectly with port 21 and not with any diferent one. I have tryed to active/desactive FTP nat helper, and reloading it (modprobe nf_conntrack_ftp ports:2121), but no success. The FTP included in tomato is not active, so… I dont know what else can I try. This is my iptables -L: Th version of tomato is: Tomato Firmware v1.28.9011 MIPSR2-RAF-NCC-VLAN K26 USB VPN-NOCAT And Port Mapping: Please, ask me for any kind of information you need. Thank you in advance!!