Read this thread:
http://www.gnutellaforums.com/showth...threadid=51357

Make sure your firewall's configured for LW. Don't run 2 firewalls together as they can interfere with each other.
Do the port test, what does it say?
Read the section about UPnP...if your router uses UPnP, you'll have to enable it in the router & in LW too (tools > options > advanced > firewall config. Tick 'use UPnP' & apply).