Living next door to Microsoft I see. Normally I would say there is a good chance you ISP is blocking you. But I doubt it in this case geographically we are not very far apart and I to am on comcast and have no problem.
Are you sure you properly set your router up when you tried port forwarding. It sounds like you know what you are doing did you set up a static IP. The link below is instructions for setting up your router for port forwarding for LimeWire.
http://portforward.com/english/route...S/Limewire.htm
I checked your mode out it does not have a firewall in it.
I also checked out your firmware and that may be your problem from what I have been able to find out you may or may not be able to use the instructions from Port Forward. You may have to do some reading to figure out how to configure your router.
http://www.sveasoft.com/ http://www.wi-fiplanet.com/tutorials...le.php/3562391