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Virtual machines stop responding (hang) during startup and the Vmms.exe process crashes on a Windows Server 2008 R2 computer that has the Hyper-V role installed

View products that this article applies to.


Consider the following scenario:
  • You are running some virtual machines on a Windows Server 2008 R2 computer that has the Hyper-V role installed.
  • These virtual machines are configured to start automatically when the management operating system (host operating system) starts.
In this scenario, some of the virtual machines stop responding (hang) when the management operating system (host operating system) is starting. These virtual machines remain in the "Starting" state and never complete starting. Additionally, the Vmms.exe process crashes, and the following event is logged in the Application log:Note Date_Time is a placeholder for the date and time of the event occurrence, and ComputerName is a placeholder for the name of the computer.

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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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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 Web site: 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 have the Hyper-V role installed on the computer.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
For all supported x64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform

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

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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

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Keywords: kbqfe, kbhotfixserver, kbfix, kbbug, kbhyperv, kbexpertiseinter, kbautohotfix, kb, kbsurveynew

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Article Info
Article ID : 974672
Revision : 1
Created on : 1/7/2017
Published on : 10/6/2011
Exists online : False
Views : 15