Your isp is Frontier right?

OSX does have it's own firewall. Ensure it is either turned off or else, configured to allow full access; OSX Firewall settings for Tiger

I am guessing your DSL connection devices are causing the problem. Most have internal NAT firewalls, so we need to know what brand & models they are. Try checking to see where your connections at back of computer lead to.

yes, i have frontier, i am wireless, and my firewall settings are allowing limewire. any suggestions?