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When you run DCDIAG on a Windows Server 2008 Domain Controller the process might fail the Naming Context Security Descriptors Test (NcSecDesc), and you may see a message similar to the following:
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Starting test: NCSecDesc
       Error NT AUTHORITY\ENTERPRISE DOMAIN CONTROLLERS doesn't have
          Replicating Directory Changes In Filtered Set
       access rights for the naming context:
       DC=DomainDnsZones,DC=CONTOSO,DC=COM
       Error NT AUTHORITY\ENTERPRISE DOMAIN CONTROLLERS doesn't have
          Replicating Directory Changes In Filtered Set
       access rights for the naming context:
       DC=ForestDnsZones,DC=CONTOSO,DC=COM
       ......................... Contoso-DC1 failed test NCSecDesc
If you have not run adprep/rodcprep, Dcdiag.exe will return an error when it runs the NCSecDesc test. This test checks that the security descriptors on the naming context heads have appropriate permissions for replication. The error indicates that the Enterprise Domain Controllers group does not have Replicating Directory Changes In Filtered Set access rights for the DNS application directory partitions.
If you do not plan to add an RODC to the forest, you can disregard this error. If you plan to add an RODC to the forest, you must run adprep /rodcprep.
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For more information, see the document “Known Issues for Installing and Removing AD DS†at the following Microsoft Web site:
http://technet.microsoft.com/en-us/library/cc754463.aspx
(http://technet.microsoft.com/en-us/library/cc754463.aspx)
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