Remote desktop access is not allowed by default in Windows 7. I change this both in the image before deployment and I also set this in group policy. if I just do this in group policy, I will be prevented from connecting to a deployed computer that has had a problem with renaming and/or joining the domain …

To allow access into a windows 7 computer from a non-windows 7 computer be sure to set … “Select Allow Connections From Computers Running Any Version Of Remote Desktop to allow connections from any version of Windows.”

For details on allowing remote desktop access see:
http://technet.microsoft.com/en-us/magazine/ff404238.aspx