Remote Desktop Issues....very strage

Hello, I'm Tom and I am an advanced IT is my situation.
I have just upgraded to Windows 7 and configured remote desktop in the same way I have on XP and Vista machines, but I have come across an issue which I cannot find a solution to.

I can remote desktop to my computer running W7 from any location, except from with the network at the college I am currently at. Port 3389 is blocked so I am using port forwarding in my router to get around this...
My first diagnosis was that the other port I use had been blocked on the network...
I have tried several different ports - some of which I know aren't blocked - and I still can't remote desktop to W7...

Any suggestions on how to solve this would be greatly appreciated, as I am out of ideas...I have tried...

Different ports
Different firewall configurations
Disabling the firewall ...

All with no success...

Thanks for your time!

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