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Windows Agent-based backup fails with error Status: 7 'VSS_WS_FAILED_AT_PREPARE_BACKUP' - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="issue"><strong>ISSUE</strong></h2> <p>Fix applies to Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 8, Windows RT, Windows Server 2012, Windows 7 Service Pack 1 (SP1), or Windows Server 2008 R2 SP1 OS's only<br><br>In this scenario, the backup task fails, and you may receive the following error message that states the Volume Shadow Copy Service (VSS) failed because of a time-out:<br>FAILED_AT_FREEZE (0x800423f2 - VSS_E_WRITERERROR_TIMEOUT)<br><br>The issue occurs because the VSS encounters a deadlock during the <a rel="nofollow" href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Fsupport.microsoft.com%2F%23thawevent">Thaw event</a> if the Security Account Manager (SAM) has pending writes for the registry.</p> <h2 data-id="resolution"><strong>RESOLUTION</strong></h2> <p>Microsoft has documented this error and provided a fix, note that this fix has a pre-requisite:<br><br><a href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Fsupport.microsoft.com%2Fen-us%2Fhelp%2F2996928%2Fbackup-task-fails-with-a-time-out-error-in-windows">https://support.microsoft.com/en-us/help/2996928/backup-task-fails-with-a-time-out-error-in-windows</a> </p> </article> </main>