My next recommendation then is to forward (open) a port on your Belkin. You will need to follow the steps very carefully in the order I list them. Most difficult is the 1st one. This is where most people make errors doing this.

1. Set up a Static ip address.
2. Forward port 6346
3. Manual port forward instructions & sample image & 2 posts after that.

For steps 1 & 2 see http://www.portforward.com/routers.htm (you didn't give me a model no. so you can find it) & you will find Belkin listed on far left column. Follow link for your model & set up a static ip for your model & the link at bottom of that page to finish the setting up of a static ip process. Then forward a port.