We are running Windows 2003 server as a FTP server (no ISA). It worked for last year. Recently, we got many users and clients reports saying they receive “FTP Folder Error – An error occurred opening that folder on the FTP server. Make sure you have permission to access that folder – The connection with the server was reset”. The Event Viewer lists ID 1- User administrator at host x.x.x.x has timed-out after 120 seconds of inactivity.
The solution we have is using active FTP instead of passive (details here http://www.chicagotech.net/troubleshooting/eventid10.htm
We have tried to re-configure the router (Cisco 830 and also tried D-Link DI-704P) and open more ports like 20, 1034 or higher. We also tried to remove the router from the picture and use the Windows 2003 connecting to the Internet directly with firewall for the test. But still get the same issue. I think it may be Windows AutoUpdate installed some security patch. Does any one know how to fix this issue on the server?