Which OS version is that? If it's XP of course it will have XP's firewall: http://www.limewire.com/english/content/firewalls.shtml

Which version of Norton is that? I've heard of issues with Norton's firewall. UKBobboy seems to have reasonable experience with it: http://www.gnutellaforums.com/showth...threadid=32877

If I may say, the most recent LW version 4.4.1 has better auto firewall configuration.