I am using 32bit windows 2008  server as  AD domain controller   . After upgrading dot net framework ,all mmc snap-ins were failing to open .

All tools like Server Manager , Event Viewer were showing an error message  like..

MMC could not create the snap-in

MMC could not create the snap-in. The snap-in might not have been installed correctly.

Name: Server Manager

CLSID: FX:{18ea3f92-d6aa-41d9-a205-2023400c8fbb}




Finally I  came to know that it is due to .netframework and it can be fixed by removing .net 3.5  or renaming machine.config  file in  .netframework 2.x  CONFIG directory .

First I ran  sfc /scannow  then renamed C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config to machine.config.old


After rebooting the server everything worked fine.


You may try to remove .net 3.5 SP1  if you dont want to rename machine.config  in .netframe work 2.x directory .




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