What does HRESULT 0x80042327 (VSS_E_REBOOT_REQUIRED) mean?

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A reboot is required after completing this operation.

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VSS_E_REVERT_VOLUME_LOST	VSS_E_TRANSACTION_FREEZE_TIMEOUT

VSS_E_REBOOT_REQUIRED

VSS_E_REBOOT_REQUIRED The VSS operation finished a stage that requires a reboot before the next action can continue. This commonly appears after restore or a workflow that changes system state.

What to check

Schedule a controlled restart and make sure the backup or restore application records the operation as reboot-pending.
After reboot, verify the final state in the backup product and VSS/Application event logs before starting a new job.
Do not keep retrying the same operation without rebooting; it can leave writers or storage in a continuing pending state.

vssadmin list writers

Microsoft: Volume Shadow Copy Service

Microsoft: vssadmin list writers

Microsoft: VSS documentation portal

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