By default LW uses port 6346. But you can change it to what works best for you. For available ports see the link in Ursula's signature about Alternative ports: http://www.gnutellaforums.com/showth...threadid=25119

To test them you can use either: http://www.grc.com/port_6346.htm or http://koti.mbnet.fi/gfactory/ctest/