Have you configured your firewalls? http://www.limewire.com/english/content/firewalls.shtml

Is your Java up to date? Java 1.5 (take the JRE)

Which version of LW are you using?

Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say ‘Test Page was a Success’. What happens when you go there?

How is your firewall setting setup? (Tools>Options>Advanced>Firewalls)