Have a look here:
http://www.gnutellaforums.com/showth...threadid=51357

Go through the test & steps for configuring firewall (remember - don't have two running together). Pay attention to the advice about UPnP. If your router uses UPnP, make sure it's enabled within the device & also within LW. Tools > options > advanced > firewall config. Tick 'use UPnP', apply.