You could try deleting the LW preference folder (instructions in link):

http://www.gnutellaforums.com/showth...threadid=36420

Here are instructions for port forwarding with Limewire:

Port Forwarding for the Linksys WAG200G

Let us know if you have any luck

Dan

P.S. I seem to recall some people having trouble with Norton. Have you allowed LW access through your Firewall? If these fixes don't work, perhaps you could try uninstalling Norton and see if you have better luck. Make a backup copy, first, if you don't have one.