OK, XP firewall & Norton DO NOT run well together! Disable XP's firewall: go to the control panel, double click on Windoze Firewall, check the disable box.

See *Configuring Norton Internet Security & double-check your settings.

Your connection type makes no diff for LW official site other than slower connection & related issues.

You'll need to read your manual to see if your router utilises UPnP. If not, then you'll need to manually forward (open) a port. Setting up a static ip is the most vital part of this. Follow the instructions carefully or else the whole process won't work!
Steps:

1. Set up a Static IP

2. Forward port 6346 & look for limewire under the following page: http://www.portforward.com/english/r...n3300index.htm (includes instructions link for setting up static ip.

3. Within LW: Manual port forward instructions & sample image & 2 posts after that.

*** However the fact that your port test worked suggests your router does understand & use UPnP. So try deleting your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire & try other suggestions in this link! Good luck!