How many green connection bars do you have? Do you see the firewall icon (brick wall in front of the blue globe)?
If you're not connected (ie no green bars) or are firewalled, check out the thread below.
Connection problems? Check here first!

If there's not a connection problem, try the fixes in the thread below
http://www.gnutellaforums.com/showth...search+results

If you still need help, post back with 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