Nowadays that has an ominous sound to it b/c so many schools block p2p use now. But, that may not be your problem.

Some high speed modems/routers use nat which is a type of internal firewall. If yours does you will need to forward a port for port 6346. You can either (a) ask your isp if they will help you open a port for 6346 (b) use the closest example you can find to yours to set yours from HERE (click on link) & choose a model from the 3rd row from left under Netgear. Just click the model in brown text (yes your model is not listed.) You will also need to set up a Static ip so see the link for it.

After forwarding a port you will need to force ip within LW: Force IP instructions & sample image

Let's hope your problem is not SP2 related.

Which ISP do you go thru?