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Troubleshooting: Exchange 2010 Management Tools Don’t Start After Installation of .NET Hotfix KB2449742

Microsoft’s Exchange team today ping about a problem that impacts Exchange management tools on servers running Exchange 2010 on Windows Server 2008 SP2, when installed “KB 2449742: MS11-028: Description of the security update for the .NET Framework 3.5 Service Pack 1 and the .NET Framework 2.0 Service Pack 2 on Windows Vista Service Pack 2 and Windows Server 2008 Service Pack 2: April 12, 2011.”

The symptoms of the problem are:

  • Exchange Management Shell doesn’t start
  • Exchange Management Console doesn’t start
  • There might be a crash in Exchange Mailbox Replication Service (it’s not clear yet if this’s related)
  • Event Viewer might have trouble opening

The following events could be logged in the Application event log:

  • Event ID: 1023
    Source: .NET Runtime
    Event ID: 1023
    Level: Error
    Description: .NET Runtime version 2.0.50727.5653 – Fatal Execution Engine Error (000007FEF9216D36) (80131506)
  • Event ID: 1000
    Source: Application Error
    Level: Error
    Description: Faulting application PowerShell.exe, version 6.0.6002.18111, time stamp 0x4acfacc6, faulting module mscorwks.dll, version 2.0.50727.5653, time stamp 0x4d54a59c, exception code 0xc0000005, fault offset 0x00000000001d9e19, process id 0x%9, application start time 0x%10.

“While we’re still investigating this problem, the failures seem to start after the .NET hotfix KB 2449742 (MS11-028) is installed. The only workaround that we’ve identified up to now is a removal of the hotfix,” informs Microsoft.

[Source: Exchange Team Blog]

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