nat and ftp

["Ing. Jorge Escudero" <escudero@xxxxxxxxxx>]

I have a firewall with iptables.

I have a nat rules becouse I have one public IP.
All PC in the LAN can access web, smtp and pop ports.
But We have problem with de ftp. We can`t conect with any ftp server.

Do you now what is the problem?

Thank you