Read through this sticky, it has loads of info & advice for connection problems
http://www.gnutellaforums.com/showth...threadid=51357

Make sure you're only running 1 firewall & that it's configured properly. Do the port test & see what result you get. Read all the info about UPnP & NAT firewalls within modems/routers... these can cause a few problems.
What are your details?

OS(Win XP etc)
LW & Java version (help > about LW & you'll see)
Firewall you're using
Modem/router brand & model
ISP
Connection type (DSL etc)
Where you connect from (home, school etc)
Are you sharing a connection with other computers
Is this your first try with LW