If you configured your XP firewall (& others) for LW here already: http://www.limewire.com/english/content/firewalls.shtml & you still have problems then you will definitely need to port forward thru your model of modem. See port forwarding instructions for WRT54G OR if yours in version WRT54G 1.1, v2 & CA see here then. And use port 6346 for LW. You will also need to configure LW as well so have a look here: LW settings image for Force IP