UTORrecover NetWorker Error: "ASR Backup: aborting VSS volume save because Quit flag is set"

When performing a Windows ASR (Automatic System Recovery) backup, NetWorker aborts the VSS-based volume save with the message:

Additional log context typically includes:

• Quit signal received

• "Handling an abort while processing Windows backup"

• Failure in obtaining VSS MBS (Microsoft Backup Services) status

• On the client system, open an elevated Command Prompt and run:

  vssadmin list writers vssadmin list shadows

  • Confirm all writers are in a Stable state.

  • If stale shadows are listed, delete them with:

  vssadmin delete shadows /all

• Test manual snapshot creation to validate VSS functionality:

  vssadmin create shadow /for=C:

7. Ensure Adequate Free Disk Space

   1. Confirm that the volume has at least 10–15% free space to support snapshot creation.

8. Check Network Connectivity & Name Resolution

   1. Run an echo request How-to check NetWorker client connectivity for UTORrecoverPreview and fix any errors.

9. Check daemon.raw and nsr_render_log on the NetWorker client (Windows host). Look for the "Quit signal received" and what precedes it.

10. Inspect the Windows Event Logs and specific VSS logs around the time of failure.