After you install version 2.0 of the .NET Framework on a server that is running Microsoft Operations Manager 2005 with SP1, you can no longer discover computers in Active Directory

You install version 2.0 of the Microsoft .NET Framework on a server that is running Microsoft Operations Manager (MOM) 2005 with Service Pack 1. After you do this, the server can no longer discover computers in the Active Directory directory service. Additionally, previously installed MOM agents that appear on the Pending Actions page now have a Desired Management Mode setting of Unmanaged.

The following event is logged:

Event Type: Warning
Event Source: Microsoft Operations Manager
Event Category: None
Event ID: 21185
Date: DATE
Time: TIME
User: N/A
Computer: Computername
Description: Computer discovery found that the following computer rules (which are 'Equals' type 'Include' rules) did not match any computers during the computer discovery scan. These discovery rules may have been specified in the Administration UI or in the ManualMC.txt file. The computer name may be misspelled or the computer or its domain may not be contactable. Domain\Computer1, Domain\Computer2, Domain\Computer3 For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Update information

The following file is available for download from the Microsoft Download Center:
Download the MOM2005-Shttp://www.microsoft.com/downloads/details.aspx?FamilyId=F53F1EF3-A7A0-4C45-AEFC-7C1EC5DCCAA6&displaylang=en-KB913812-X86-ENU.MSI package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=F53F1EF3-A7A0-4C45-AEFC-7C1EC5DCCAA6&displaylang=en)

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

File information

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

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

For the update to work correctly, the local Network Service account must have full control of the HKLM\Software\Microsoft\.NetFramework\Policy\AppPatch\v2.0.50727.00000 registry subkey. To do this, follow these steps:

1. Grant the local Network Service account full control of the following registry subkey:
   HKLM\Software\Microsoft\.NetFramework\Policy\AppPatch\v2.0.50727.00000
2. Restart the MOM service on the management servers that have this update installed.