Alright, my friend is trying to use Limewire, but he is stuck with a constant one connection bar, and he can't use Limewire. It also gives us the firewall icon, but he doesn't have his firewall enabled, and he doesn't have any other programs that could do it. He has an iMac, an airport card in his iMac, and a Linksys BEFW11S4 Router (Version 3). We have tried most of the tutorials on this site, and none of them are working. If you need more information, or if you happen to know the answer, please post! Thanks.

Edit: Oh, yeah, he's on Mac OS X Tiger 10.4.7.