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The network connection of a running Hyper-V virtual machine is lost under heavy outgoing network traffic on a Windows Server 2008 R2-based computer
If you’ve deployed your Virtual Machine on Hyper-V R2 and noticed that a connection between the guest and the virtual switch starts "acting odd", perfoms poorly or becomes disconnected entirely, you may want to apply this update:
Prerequisites
To apply this hotfix, your computer must be running Windows Server 2008 R2.
Additionally, you must have Hyper-V role installed on your computer.
Restart requirement
You have to restart the computer after you apply this hotfix
Categories: Virtualization
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Just tested the hotfix on a server, and Linux servers still lose their network connection after a while. Live migrating them to another node wakes them up again, though, but may mess up NFS mounts etc