Westell do not utilise UPnP very well. I'd recommend port forwarding the device.

First step is most important:

1. VISTA Static ip setting up

2. Find your model here PortForward.com - Free Help Setting up Your Router or Firewall click on the model link, on following page find LimeWire link. Try a port somewhere between 49152 - 65535, such as 64049. Do it for both TCP & UDP. Don't forget to also do that for LW settings connection & listening port too in LW's advanced settings.