Description
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.
Cause
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.
Resolution
To resolve this problem:
- Open dcomcnfg.exe, expand Component Service, Computers, then right click My Computer and choose Properties.
- Select the Com Security tab then click Edit Default… under Access Permissions.
- Click Add…, then enter Network Service in the Enter the object names to select text box, and click OK.
- Confirm that only Local Access is selected, then click OK.
- Restart the Hyper-V host machine(s) for the settings to take effect.
Keywords
Hyper-V, guest VM, VSS, access denied, network service
