Virtualization, Servers and Storage : UTORrecover NetWorker Error: "ASR Backup: aborting VSS volume save because Quit flag is set"

Created by JM Lopez, last modified on Sep 19, 2025

(blue star) Problem

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

ASR Backup: aborting VSS volume save because Quit flag is set.

Additional log context typically includes:

  • Quit signal received

  • "Handling an abort while processing Windows backup"

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

(blue star) Solution

1. Validate VSS Health & Shadow Copies

  • 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:

If manual snapshots fail or writers are unstable, address those issues first.

  1. Ensure Adequate Free Disk Space

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

  2. Check Network Connectivity & Name Resolution

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

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

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