Port for Remote web workplace RDP client?

Matrix1000 used Ask the Experts™
What port do I need to set on my firewall to enable the SBS remote web workplace 'To connect to a computer' functionality?
I've already pointed HTTPS to the server and can get OWA etc but cant get the remote computer conneciton to work. Do I also have to point port 3389 to the server as well?
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3389 - RDP for remote administration
4125 - Remote Web Workplace

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