We have this issue have in few client of ours running 2012 or 2012 R2. From time to time those Hyper V base will lose the ability to manage all the virtual machines. There is nothing in Hyper V manager and you can't add itself into the management console.
Restart the hyper V manager service do nothing for it. the only way we can do is get into each each vms to shut them down and do a restart on the hyper V base OS. Those affected some are clustered some are just stand alone.
Lin Xiang Correct Solutions
