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Troubleshooting Active Directory Replication Problems

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Updated: March 20, 2014

Applies To: Windows Server 2008

Active Directory replication problems can have several different sources. For example, Domain Name System (DNS) problems, networking issues, or security problems can all cause Active Directory replication to fail.

The rest of this topic explains tools and a general methodology to fix Active Directory replication errors. For a hands-on lab that demonstrates how to troubleshoot Active Directory replication problems, see TechNet Virtual Lab: Troubleshooting Active Directory Replication Errors.

Inbound or outbound replication failure causes Active Directory objects that represent the replication topology, replication schedule, domain controllers, users, computers, passwords, security groups, group memberships, and Group Policy to be inconsistent between domain controllers. Directory inconsistency and replication failure cause either operational failures or inconsistent results, depending on the domain controller that is contacted for the operation, and can prevent the application of Group Policy and access control permissions. Active Directory Domain Services

(AD DS) depends on network connectivity, name resolution, authentication and authorization, the directory database, the replication topology, and the replication engine. When the root cause of a replication problem is not immediately obvious, determining the cause among the many possible causes requires systematic elimination of probable causes.

For a UI-based tool to help monitor replication and diagnose errors, see Active Directory Replication Status Tool. There is also a hands-on lab that demonstrates how to use Active Directory Replication Status and other tools to troubleshoot errors.

For a comprehensive document that describes how you can use the Repadmin tool to troubleshoot Active Directory replication is available; see Monitoring and Troubleshooting Active Directory Replication Using Repadmin ( ).

For information about how Active Directory replication works, see the following technical references:

    Active Directory Replication Model Technical Reference ( )

Active Director Replication Topology Technical Reference ( )

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