I have Win 2008R2 server with Hyper-V role installed. 7 Vm running, mix of Win 2003r21, Win2008R2, and 1 Win XP Pro. I can connect to all except 1 of the Win2008R2 VM's within Hyper-V manager, both on the Hyper-V server and from my WIn 7 box with Hyper-V manager installed . I was able to do this just last week. I am still able to connect to it by using Remote Desktop from my Win 7 machine. I just get "Cannot connect to virtual machine. Try to connect again. If problem persists, contact your system administrator". I can nto find anything relevant in either the VM's system logs or the Hyper-V server's system logs to point to the problem.