Perhaps I can review this when I come back online but at 1st glance: Many schools & school residences do nowadays block p2p.

1. Do this very simple test & tell us what happens; go here: http://www3.limewire.com:6346/ (it should say Test page was a success.)

2. Go here: http://www.u.arizona.edu/~trw/games/nat_or_not.php & ignore everything you dsee except the grey part that talks about you. Just tell us what it says about NAT. Don't tell us enything else about what it says.