I am receiving "The requested session access is denied" when attempting to log in to my experimental TS 2008 machine. This machine is also running domain controller role. I know it's a bad idea, but it is just a test environment.
The problem I ran in to is that I can't add cross domain users into the Remote Desktop Users group. As a result, I created a new Domain Local group that has all my TS remote access accounts.
I went into Group Policy and updated the Default Domain Controller policy to include the new group, "Test Remote Users", but I'm still receiving the above error. If anyone could point me to where this is hanging up I would appreciate it.