Hyper-V VSS error: hr=0x80070005, Access is denied

September 17, 2025

Product Version

AhsayOBM / AhsayOBR: 7 or above

Operating System

Windows

Symptom

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.

unexpected-error-querying-for-the-IVssWriterCallback-01.png

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:

  1. Open dcomcnfg.exe, expand Component Service, Computers, then right click My Computer and choose Properties.

    unexpected-error-querying-for-the-IVssWriterCallback-02.png

  2. Select the Com Security tab then click Edit Default... under Access Permissions.

    unexpected-error-querying-for-the-IVssWriterCallback-03.png

  3. Click Add..., then enter Network Service in the Enter the object names to select text box, and click OK

    unexpected-error-querying-for-the-IVssWriterCallback-04.png

  4. Confirm that only Local Access is selected, then click OK.

    unexpected-error-querying-for-the-IVssWriterCallback-05.png

  5. Restart the Hyper-V host machine(s) for the settings to take effect.
Troubleshooting