Try port forwarding the home hub. To do this click your Hub Manager and click advanced. The user name and password should be "admin" for both. Then click "toolbox" and "Game and application sharing".

Your game isn't in the pre assigned port list already so you will have to maunally create one.

Click "create a new game or application". Give it whatever name you want and assign the ports by making sure that "manual entry of port maps" is selected.

At the next window make protocol is set to "any" and that "port range" and "translate to..." are the same port number (the one used by the game). You can ignore the Trigger stuff. Now assign it and run the game and it should connect.

Let us know what happens.