Backup job reports Unfreeze Error (Over VIX)

KB ID: 1787
Product: Veeam Backup & Replication
Version: 6.x, 7.x
Last Modified: 2014-10-17


Backup job returns an error:
Unfreeze error (over VIX): [Backup job failed.]

Running vssadmin list writers command may result in:
Non-Retryable error for Volume Shadow Copy Service (VSS) of the Microsoft® Exchange Replication service


This issue is Microsoft-related and occurs when the VSS writer in charge of Microsoft Exchange Replication fails.


  1. Reinstall or perform a repair-install of VMware Tools.
  2. Reboot guest operating system of the backed-up VM if possible.
  3. In case neither of the above solutions work, see the VMware KB explaining how to troubleshoot VSS-related issues.
  4. In case none of the above helps, please contact MS Support for further assistance.

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