FTP problem

From: Mario (taylormario_at_hotmail.com)
Date: 02/21/04 

Date: 21 Feb 2004 04:15:28 -0800

Hi!

When I try to connect to two ftp servers which resides under the same
IP-adress, I only succeed with one of them. I use WS-FTP on my
xp-machine behind a linux router that has a firewall. The difference
between the two ftp servers that I try to connect to is that one of
them uses port 21 and the other one doesn't. The former one results in
a message that reads: Blocking call cancelled, Retrieve of folder
listing failed.

Has it something to do with my linux machine and if so, how can I
resolve it?

Thanks