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Update to Microsoft Entra Connect causes SQL VSS issues

KB ID: 2326
Product: Veeam Backup & Replication
Published: 2017-07-31
Last Modified: 2025-08-12
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Article Applicability
This article is specific to environments where the Azure AD Connect or Microsoft Entra Connect package is installed on the machine where Microsoft SQL Server is installed.

Challenge

You receive the following error during the guest processing:

Unable to release guest. Error: Unfreeze error (over VIX): [Backup job failed. Cannot create a shadow copy of the volumes containing writer's data. 
A VSS critical writer has failed. Writer name: [SqlServerWriter]. Class ID: [{a65faa63-5ea8-4ebc-9dbd-a0c4db26912a}]. Instance ID: [{6323fe10-0205-47df-b015-4a5ff60c31e2}]. 
Writer's state: [VSS_WS_FAILED_AT_PREPARE_SNAPSHOT]. Error code: [0x800423f4].]

Solution

If an update to Azure AD Connect or Microsoft Entra Connect was recently installed, a repair of the SQL installation should fix the issue.
Note: Even if a recent update wasn't installed, it may be worthwhile to attempt the repair.

  1. Open the list of installed applications.
  2. Find and select the Microsoft SQL Server 20XX Express LocalDB entry.
  3. Click Modify.
Screenshot of Microsoft SQL Server LocalDB entry within installed applications list with the Modify button highlighted.
  1. Within the installer wizard, select the option for Repair.
    Note: In some scenarios, a reboot may be required.
Screenshot of the Microsoft SQL Server 2019 LocalDB installer showing the Repari and Remove options with the Repair option selected.
If repairing the SQL Express LocalDB does not help, further SQL Server Writer troubleshooting will be required. As a workaround, until the issue with the SQL Server Writer is resolved, you can configure the backup job to allow creating crash-consistent backups by setting it to "Try application processing, but ignore failures."

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