Hyper-V unable to start or connect

Received this error when I was working with my Hyper-V servers. It’s easy to solve but the hos machine has to be rebooted and therefore all the VM machines will be unavailable for a while during the reboot.
Error:
[plain]Cannot connect to the virtual machine because the authentication certificate is expired or invalid. Would you like to try connecting again?[/plain]
This error is due to the VMMS certificate expiring. So just run the KB fix and the issue will be gone!

More info: http://support.microsoft.com/kb/967902
Direct download of the fix: http://www.microsoft.com/downloads/details.aspx?FamilyID=289c831c-9142-4c00-bacd-6c1924ff0ecc

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