I have a Windows Server 2003 and I have FTP setup on it using port 2121. Internally I can get to it just fine but when I go thru the firewall from the outside it times out and I get a blank page. Initially I thought it was the Cisco ASA firewall so I opened up a case with Cisco, they looked at it and the firewall is allowing the traffic to go thru on port 2121. That's the only port I have opened on the firewall.
So the problem must lie on the server side. Any thoughts?