ftp ls & dir problem

[Jean-Yves BARBIER <jybarbier@wanadoo.fr>]

Hi all,

I have a huge problem on my station: every time I try to
ftp any external (web) service, the connexion is Ok, but
when I try to make 'ls' or 'dir' no way! the answer' still
the same: 

 500 Illegal PORT Command
 ftp: bind: Address already in use
 
LAN: station PII400, 2.2.10, ftp=system base installation
     server 486DX4/75, 2.2.10, ftp=system base installation
     (firewall/gateway to cable-modem)
     
AND not any log trace in any machine!

BUT it works perfectly from the station to the server...
Aaarghh, I'm gonna make a nervous poo!

Any suggestion will be very welcomed.

JY