Hyper-V and antivirus

I recently ran into an issue with creating a new VM on Hyper-V.  It would sometimes let me create the VM, and other times it would fail to create it and give me some error like the following:

VMName’ Microsoft Synthetic Ethernet Port (Instance ID{7E0DA81A-A7B4-4DFD-869F-37002C36D816}): Failed to Power On with Error ‘The specified network resource or device is no longer available.’ (0x80070037).

If I managed to the get the VM created, it woudl not start (always had the error above).  After fooling around with the Hyper-V settings for a few minutes, I Googled the issue, and found a handy Microsoft KB article that explained the problem.  Apparently some antivirus real-time scanners cause this until you add exceptions for the files/folders used by Hyper-V.  After adding these exceptions, everything is much smoother 🙂

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