You don't have to remove a firewall, unless you have 2 running (only run 1 or it'll cause probs). Just make sure your firewall's configured for LW. Instructions for it here
http://www.gnutellaforums.com/showth...threadid=51357

Firewall probs can also be due to modems/routers having an internal firewall. There's info in the thread...see if your router has a NAT firewall. If your router uses UPnP, it should be turned on in the unit & also ticked within LW (tools > options > advanced > firewall config. Tick use UPnP & apply). Do the port test & see what result you get (see link).

If this isn't any help, tell us 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