Quote:

I'm using a wireless router




Wireless routers are yucky for WAN connectivity.
Do you have a normal router you can use instead?

There is also another alternative and that is that you ISP is blocking your signal. Alot of ISPs will block any game-like or web-like traffic from their networks. Their philosophy is that you are paying them to use the internet and not host names. There is no easy way of finding this out except just calling them outright and asking about their policies though I don't know how forthcoming they will be.