Most administrators use remote desktop to take control of their UAG server rather than working on the server locally. However, unless you installed your server using remote desktop, you may find that you are unable to connect to it. This is not a bug, but an out-of-the-box security mechanism that's intentionally there to protect UAG from unauthorized access. Remote access to UAG is then only permitted from sources that have been explicitly listed in TMG. So as an administrator, you would need to add your required sources to the predefined remote management object. To do so, the following steps are to be carried out:
1. Open the TMG console.
2. Click on Firewall Policy.
3. On the right-hand side of the screen, go to Toolbox.
4. Expand Network Objects.
5. Expand Computer Sets.
6. Double-click on Remote Management Computers.
It's probably worth mentioning that modifying the TMG configuration directly is normally not supported, but the preceding procedure is...