AhsayOBM / AhsayOBR: 220.127.116.11 to 7.x
ATTENTION 1st January, 2022: v7 officially End-of-Life [details]
When performing a backup or restore of a Hyper-V guest virtual machine, the following error message is logged in the Window Event Viewer:
Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005, Access is denied
Although, there are VSS related errors the Hyper-V guest backup / restore jobs was completed successfully without any warnings or errors.
This VSS related error is caused by a Window VSS configuration issue.
Note: This error does not affect the integrity of the guest virtual machine backup or restore job.
To resolve this problem:
Hyper-V, guest VM, VSS, access denied, network service