User_Name...
Try Port Forwarding your router, these are your instructions...
Port Forwarding for the Dlink DI-524
You should also be able to make an exeption in PC-Cillan for Limewire...
You need to allow incomming and outgoing traffic...
This link is for both, just click on them and scroll down and select Limewire...
PortForward.com - Free Help Setting up Your Router or Firewall