Just momentarily, try disabling your netdefence firewall also and try connecting. If still no good, my guess is router is problem.

Port forward router: First and most important step is setting up a static ip: 1. Static ip instructions
2. PortForward.com - Free Help Setting up Your Router or Firewall and find your model and click that link, then find limewire on list.
3. Settings within LW, will be described in the above link.