FTP: Error opening data socket

[ITdev]

Hi,
I just set up IIS on a win2k server. I have a router which has nat. I got that to work, logging in is fine.

When I upload something to FTP server from a client PC, I get an error "Error opening data socket"... "Can't send command" I use CuteFTP to log in from the client.

Does anyone know what that mean and how to resolve that??

Thanks in advance

 

[Guest_imported]

I believe you need to open port 20 also I may be wrong though