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Event ID: 1481 Source: NTDSReplication

Level
Description
Internal event: The operation on the object failed with the following internal error string: <error details>.
Comments
 
When information is replicated from a Microsoft Windows 2000-based domain controller to a Microsoft Windows Server 2003-based domain controller, the replication process is not completed successfully.  Additionally, if you increase the logging level for internal processing to 4 in Windows Server 2003, this warning event will be logged. See ME824873 for a hotfix applicable to Microsoft Windows 2000.

As per Microsoft: "This problem occurs when an Active Directory object that is currently being used is deleted from the Active Directory directory service. In this situation, the replication engine will try to delete the object later". See ME911015 for additional information about this event.
See the link to "EventID 1481 from source NTDS General" for information on this event.

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