Have a look here for basic connection tips:
http://www.gnutellaforums.com/showth...threadid=51357

Make sure your firewall's configured for LW & that you're only running 1 firewall (2 will cause probs). Check out whether your modem/router uses UPnP. If it does, turn it on in the router & also use it in LW ( tools > options > advanced > firewall config. Tick 'use UPnP & apply). Do the port test.
All this stuff's in the thread