I have no idea what an Isp is. Not vary computer savy.
But I know I have:

Windows Xp

Limewire 4.10.3 Pro, Java 1.6.0-Beta

I have the windows firewall disabled but I also have a McAfee firewall and that is allowing limewire

If it is a motorola surfboard sb4100 cable modem

I have a cable connection from home with no other computers

I have used limewire for a year with no problems at all

I have already tryed configuring my firewall many times

And the port test worked

If you could try to explain what an Isp is that would be great. Thanks