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I just hit my THIRD instance of a Hyper-V guest machine dying with the exact same behavior. In all three instances we are hosting WS2008 guests on a WS2008 host. AFter a config change, we reboot the guest and the guest OS comes up but in a very cripled state. Specifically, we are able to log into the guest, but can't launch any apps and the guest never comes active on the network.

I opened a support ticket with MS the second time this happened and they focused in on the DCOM subsystem not coming explanation they could provide was that permissions on key system files got corrupted. I eventually gave up on the ticket after close to 10 hours on the phone trying different things that were going no where.

What really concerns me is that we have now seen the exact same thing happen to a guest hosted on a completly differet host machine. There is zero hardware overlap between the two.

Has anyone seen this before?? It's really odd behavior, but it also seems like there's a pattern here that's concerning me.

Thanks, jon

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What is the config change you made before you rebooted the guest? Was it working just fine before you made the change? – August Aug 5 '09 at 19:45
I would start looking at common software or configurations between your guests. Maybe it is not a Hyper-V issue. – Doug Luxem Aug 5 '09 at 19:47
Also, what kind of storage? Is this local disk or a SAN of some kind? Could you be having disk issues that is corrupting the images? – Kevin Kuphal Aug 5 '09 at 19:57
The config change has been different all three was applying a CRM update, one was completing OCS install, other was adding a CPU. – Jon Rauschenberger Aug 5 '09 at 20:01
On one host, the guest was running on a local RAID array, on the other it was on an attached SAN drive. The hosts are totally seperate, one is here in our office one is in our data center. – Jon Rauschenberger Aug 5 '09 at 20:02

Any antivirus on the host OS? AV software with "live scanning" can cause problems but I'd imagine you'd have found that quicker as it's quite a known thing.

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erm. Just checking....but the servers have been activated, right?

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Yep...servers were fully activated. – Jon Rauschenberger Sep 16 '09 at 14:30

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