In the last post i just read, someone says they are using FORCE IP and entering their host IP behind the firewall (e.g. 192.168.1.x).

That don't make sense!

Isn't the whole point to enter the Internet IP address (the address being mapped/forwarded)? The Limewire application already knows the local host IP! It's the host's Internet IP (the address that is mapped/forwarded by the router/firewall) that Limewire doesn't know.