G4 400 / OS 10.2.8, BSD installed / Limewire 3.6.14

I have Norton Personal Firewall set to leave ports 6346 & 6347 open for Gnutella.
~*~

When I try to open Limewire, Norton P/F tells me:

"The program Limewire has opened port 45100 on your computer, but your firewall does not allow connections to this port. Do you want to change your firewall's settings so connections to this port are allowed?"

*confused* Why is Limewire opening that port?
Do I need to change my firewall settings, or should I just ignore this?

~Candy Angel