VSS_E_SNAPSHOT_SET_IN_PROGRESS error when you try to back up a virtual machine in Windows Server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard


Important The hotfix that corresponds to KB 2801054 has been included with the hotfix KB 2848344, which contains all fixes that were previously included in KB 2801054.

Consider the following scenario:
  • You configure a Windows Server 2012-based file server failover cluster.
  • You create a file share resource (\\fs1\share) on the cluster.
  • You create a Windows Server 2012-based Hyper-V server and configure a virtual machine (VM1) on the server.
  • The virtual machine files for VM1 are stored on \\fs1\share.
  • You run a Volume Shadow Copy Service (VSS)-aware application to back up VM1 on \\fs1\share.
  • The application stops unexpectedly, and the backup request is interrupted prematurely.
In this scenario, a VSS_E_SNAPSHOT_SET_IN_PROGRESS error occurs, and the backup process fails.


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must be running Windows Server 2012.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates