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by: nociPosted on 2009-09-01 at 13:57:44ID: 25235982
If there is a firewall in between then that's probably where the problem starts...
well FTP is the problem,
normally FTP communicates over port 21, and firewall have an extra function on board to monitor this port 21 traffic for hints to open up an extra link that goes across port 20 and some negotiated port.
Using a different ports makes it impossible to track port 21 traffic, also the traffic is now encrypted making it impossible for the firewall to snoop the portnumbers.
Maybe this is the right time to start using the scp protocol. AFAIK WinSCP should support that too (it's named after it... ;-).
scp copies files through an encrypted ssh tunnel.