Media for RDP from outside network

RDP from outside network

I apologize for cross posting this issue to multiple lists, but it is necessary because there are a few different technologies and solutions that require assistance from different professionals.

First of all, I am still fairly new to networking, so please be gentle. I need to allow RDP connections to a server from outside of the LAN. VPN is out because of multiple VPN clients on remote computer that are conflicting. In the Windows group, it was suggested that I "create a tunnel through the firewall" and change the default port that the RDP service listens for on the server. First of all, is this a good solution, and second of all, how do I configure this on the firewall??

Thanks in advance for all of your help and suggestions.

Sincerely,

Matt Atkins