1-800-691-1991 | 9am - 8pm ET

Hyper-V backup or replication job with guest-processing fails after installing Windows Update KB3000853

KB ID: 1962
Product: Veeam Backup & Replication
Version: 7, 8
Published: 2014-11-20
Last Modified: 2020-08-13
Languages: FR


After installing November roll-up update on 2012 Hyper-V hosts, VSS-enabled backups may be failing in any backup solution.

In Veeam you will get "Unable to allocate processing resources. Errors: Failed to create snapshot for vm..." The error message in logs is as follows:

<01> Error    Failed to analyze snapshot availability for task '1c6d5578-8e5f-4fea-89b7-33afee0dfaf0' (System.Exception)
<01> Error       at Veeam.Backup.ResourceScheduler.CHvSnapResDispatcher.CanAcquireResource(CResDispatchIterationContext dispatchContext, CResourceTask task, IResourceRequest resourceRequest, IResourceResponse[] acquiredResources)
<01> Error       at Veeam.Backup.ResourceScheduler.CResourceTaskScheduler.IsAllResourcesAvaliable(CResDispatchIterationContext dispatchContext, CResourceTask task)
<01> Error       at Veeam.Backup.ResourceScheduler.CResourceTaskScheduler.DispatchPendingTask(CResDispatchIterationContext dispContext, CResourceTask task)
<01> Error    Failed to create snapshot for vm 5864ae48-bc3c-4cd9-9503-f637da801ccb (System.Exception)

Replication job may yield the following error:

<13> Error Value cannot be null. 
<13> Error Parameter name: node at Veeam.Backup.Common.CXmlHelper2.TryToGetAttrInternal(XmlNode node, String attrName, String& foundValue) 
<13> Error at Veeam.Backup.Common.CXmlHelper2.GetAttrAsString(XmlNode node, String attrName)


The issue occurs because the Volume Shadow Copy Service (VSS) encounters a deadlock during the Thaw event if the Security Account Manager (SAM) has pending writes for the registry.


Microsoft is aware of the issue and is working to resolve this. Uninstalling KB3000853 update should resolve the issue (reboot required).
The hotfix has been issued as well
KB ID: 1962
Product: Veeam Backup & Replication
Version: 7, 8
Published: 2014-11-20
Last Modified: 2020-08-13
Languages: FR

Couldn't find what you were looking for?

Below you can submit an idea for a new knowledge base article.
Report a typo on this page:

Please select a spelling error or a typo on this page with your mouse and press CTRL + Enter to report this mistake to us. Thank you!

Spelling error in text

Knowledge base content request
By submitting, you agree that your personal data will be managed by Veeam in accordance with the Privacy Policy.

ty icon

Thank you!

We have received your request and our team will reach out to you shortly.


error icon

Oops! Something went wrong.

Please go back try again later.