I can't seem to be able to have multiple administrators connect to Windows Server 2008 R2 Standard. Each time a different administrator logs in, it takes the current session away from the user and gives it to them and boots the original user from the server.
I've also tried connecting 1 instance normally and a 2nd with the /admin flag on remote desktop and that didn't matter either.
Best Answer
Shared accounts are a audit nightmare and security risk. That being said.. If you must use the same account for multiple users
Check the Group Policy for "Restrict each user to a single session setting"
Changes to remote administration in Windows Server 2008