When the main screen is open, there is an Advanced tab on the right. Then at the lower left, there will be Settings. 2011 should have an RD Gateway, which is why the router doesn't need port 3389 open, and you can get to any computer remotely without port forwarding.
You can try setting up the RD Gateway so it is set only for that -- mostly the middle boxes. Or skip RD Gateway so it remotes directly to the computer. You may have to use the FQDN on the computer in question so if it is "Computer" it would be Computer.domain_name.local. But, you don't have a domain but you do have the four letter one called Raish or something.
