Hyper-V VMs getting stuck at "Stopping"

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http://serverfault.com – I have a HP ProLiant MicroServer running Windows Server 2012. It has the Hyper-V role installed, and I have tried guest VMs running both Windows Server 2012 and 2008 R2. The issue I have is that on shutdown (whether in the guest OS or via Hyper-V Manager), reboot, or just attempting to "Turn Off" a guest machine, Hyper-V Manager reports the status as "Stopping" and takes anything between 5 minutes and several hours to get any further: Any open connection to a guest machine during this progress seems to just freeze at the point it should actually switch off or restart. With a bit of invest (HowTos)