MMC has detected an error in a snap-in and will unload it

MMC has detected an error in a snap-in and will unload it

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Good morning AskPerf!  Madhurjya here from the Windows Performance Team to alert you on an emerging issue where random MMC snap-ins will fail after installing the June 2012 .NET updates.

After installing these .NET updates on a Windows 7 or Windows Server 2008 R2/SP1 machine, certain snap-ins will fail.  Most notably, the Server Manager and Event Viewer snap-ins.  The following errors will be displayed when you try and open these:



If you are receiving these errors, please install one of the following hotfixes for .NET Framework:

Hotfix Rollup 2688729 is available for the .NET Framework 2.0 SP2 on Windows 7 or on Windows Server 2008 R2

Hotfix Rollup 2688730 is available for the .NET Framework 2.0 SP2 on Windows 7 SP1 or on Windows Server 2008 R2 SP1

As a note, we have not seen this issue with 32-bit snap-ins.  To confirm this, you can launch 32-bit snap-ins with the following syntax:

mmc.exe /32 snap-in.msc

If the above hotfix does not resolve your issue, please open up a case with Microsoft Technical Support to further troubleshoot your issue.

Have a great weekend!


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  • Hotfix Rollup 2733946 is available for the .NET Framework 2.0 SP2 on Windows Vista SP2 and on Windows Server 2008 SP2

  • when we are enable  remote desktop session  host then we are see error mmc has detected an error in a snap in and will upload it. so how can resolve it tell me its very urgent

  • will this work with windows server 2008 enterprise

  • your command mmc.exe /32 snap-in.msc fails on my netbook..."mmc cannot open the file snap-in.msc

    This may be because the file does nto exist, is not an mmc console, or was created by a later version of mmc.  This may also be because you do not have sufficient access rights to the file."  using windows 7 starter, service pack 1.  32 bit o/s.

  • Snap-in.msc is not a an actual snap-in file.  You need to replace it with the name of snap-in that your trying to load.  For example mmc.exe /32 gpedit.msc

  • Hello,

    The links you provided do not contain any downloads.

  • @Omar:  You must contact Microsoft Customer Support Services to obtain the hotfix.

  • Please suggest, Can I apply above hotfix for .net framework 3.5 on Windows Server 2008 R2 SP1

  • The above links do not work and show the following error: An error occurred while processing your request. Reference #97.344b0317.1391113434.2c30faf7

  • I have a Windows Server 2008 R2 SP1with this situation and just applied Hotfix 2688730 but it did not fix anything, I keep getting the error message when I open Event Viewer and Server Manager. My server has all of the automatic updates applied. What can I do? I need to solve this issue as soon as possible.

  • This issue might occur if there is an incorrect setting in one of the following registry subkeys:
    •HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
    •HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
    In my case, the HKCU value "Personal" was emtpy.
    After I changed the value into %USERPROFILE%\Documents the problem was solved!

  • I know this is an old thread but I managed to resolve this error by running sfc /scannow

  • Is there a hotfix for windows 8.1 for this?

  • I'm getting the same problem but with Windows Server 2012 R2 Std.

  • Me too with Server2012 R2 Std