Active Directory replication error 8464: Synchronization attempt failed

Applies to: Windows Server, version 1903Windows Server 2019, all versionsWindows Server version 1803


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This article describes the symptoms, cause, and resolution for resolving issues in which Active Directory replication fails and returns error 8464:

Additionally, and Event 1704 entry that resembles the following is logged:

Note It is typical to see Active Directory replication status 8464 after you extend the schema or after you add new attributes to the partial attribute set (PAS). This message states that replication is delayed temporarily. Active Directory replication status 8464 goes away after the PAS finishes the update process.


This issue occurs because PAS synchronization is triggered when an attribute is added to the PAS.

For the details, see the "More Information" section.


Because this is a standard part of PAS synchronization, resolution steps are usually not needed. See the "More Information" section for troubleshooting steps if this replication status persists in the environment for more than a week. 

More Information