I have an issue happening now with my Win7 Pro workstation. It just started a couple of days ago. I can no longer send a remote assistance request. This error immediately appears after choosing the IP or name of the remote machine.
It has nothing to with GPO's or group membership. I have checked all of the 'normal' settings, all of which are set correctly
We have been using this feature for some time & it still works on every machine, except mine. I remember there being an issue with Vista RA when I first began using it. I think it involved COM security issues.
What I theorize is that either a Windows update or application was installed changing a security setting but I have forgotten where to look.