A few thoughts…
Try changing the Passive Transfer checkbox on the advanced tab of the connection. If it’s checked, uncheck it and vice versa.
If you are using the Microsoft TCP/IP stack, part of the Windows 95 and NT operating systems, try setting the Maximum Transfer Unit (MTU) to 576.
If you are using a software firewall; try shutting it down and see if you get the same error.
The only other thing I can say is that the problem is at your end not the server.
HTH,
Carlitio.
