Cannot get Port Forwarding to Work

Hey guys, recently bought the WNDR3800 as a replacement for my WRT54GL that was running tomato for years rock solid, but was showing signs that I needed to upgrade.

So here I am, purchased a brand new WNDR3800 and am already pulling my hair out.

I am trying to get Remote Desktop to work through port forwarding just as simply as I did with my WRT54GL, and its driving me nuts cause it refuses to route to the internal port from the external port.

Example:

External Starting and Ending port are both 25001

Internal starting and Ending Port is 3389

Internal IP addres is set to the computer that I want to Remote In on the Network.

This just does not work, it had zero issues on myh Linksys.

I have also tried to have both internal and external ports at 3389, that worked with zero issues. But I have can't my starting port be anything else.

Anyone have any ideas?

Thanky you very much with your replies.