VSS Backups not working after Windows 10 creators update 1709

Hello everyone,

just wondering whether anyone else has experienced problems with Avamar VSS Backups of Windows 10 clients since the creators update (1709) was rolled out.

I have a relatively new Win10 Client. Backups of Filesystem and VSS were working fine until the creators update was installed a couple of weeks ago. Now the VSS backups fail after 30 seconds. This is happening on all Windows 10 clients (Professional) with this update.

Error code is 10007

Filesystem backups are still working fine. But the System State backups are no longer working.

In the logfiles I see this:

2017-11-28 20:00:25 avvss Info <16480>: EFI system detected. ASR BCD will not be included in shadow copy

2017-11-28 20:00:25 avvss Info <19014>: Determining best VSS provider for volume 'c:\'

2017-11-28 20:00:25 avvss Info <40027>: Volume c:\ will be frozen by 'Microsoft Software Shadow Copy provider 1.0' in Snapshot {a38bcfd5-e1d9-4341-aedb-e9f403391672}

2017-11-28 20:00:25 avvss Info <8776>: Freezing volumes now...

2017-11-28 20:00:25 avvss Info <8780>: Creating the shadow copy set (DoSnapshotSet) ...

2017-11-28 20:00:28 avvss Error <10975>: ERROR: Selected writer 'ASR Writer' is in failed state!

   - Status: 8 (VSS_WS_FAILED_AT_PREPARE_SNAPSHOT)

   - Writer Failure code: 0x800423f0 (Der Schattenkopiesatz enthält nur eine Teilmenge der

Volumes, die für eine ordnungsgemäße Sicherung der ausgewählten

Komponenten des Generators notwendig sind.)

   - Writer ID: {be000cbe-11fe-4426-9c58-531aa6355fc4}

   - Instance ID: {5ee97a67-801b-4754-ab89-98f2f8d093c5}

2017-11-28 20:00:28 avvss Error <10976>: ERROR: Selected writer 'ASR Writer' reported an error!

   - Status: 8 (VSS_WS_FAILED_AT_PREPARE_SNAPSHOT)

   - Writer Failure code: 0x800423f0 (Der Schattenkopiesatz enthält nur eine Teilmenge der

Volumes, die für eine ordnungsgemäße Sicherung der ausgewählten

Komponenten des Generators notwendig sind.)

   - Writer ID: {be000cbe-11fe-4426-9c58-531aa6355fc4}

   - Instance ID: {5ee97a67-801b-4754-ab89-98f2f8d093c5}

2017-11-28 20:00:28 avvss Error <12077>: VSS returned an error message exiting HR = 0x8000ffff

2017-11-28 20:00:28 avvss Info <0000>: Finished with backup. Performing cleanup.

The text in German above translates to:

The shadow-copy set only contains only a subset of the volumes needed to correctly backup the selected components of the writer

Avamar Version 7.3.1-125 (Server & Client)

I've already tried rebooting the clients.

Just after the backup fails, I ran vssadmin list writers. It showed the ASR Writer in a failed state. But after a while the writer returns to a stable state.

Any ideas?

Thanks and regards,

Stephen