coopster - 5:20 pm on Apr 3, 2009 (gmt 0) It was a painfully slow troubleshooting process for me if you can't tell.
To determine if that is the issue you can bypass the router. Connect your Windows XP Pro pc directly and set the credentials in a new network connection, broadband connection. If you are able to successfully FTP without issue, you may have resolved your problem. Notice I said "may have" resolved :P
It was a painfully slow troubleshooting process for me if you can't tell.