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When you back up and then restore the Directory service on a relative ID (RID) operations master (also known as flexible single-master operations or FSMO) domain controller (DC), duplicate Security ID (SID) events may appear in Event Viewer.
This problem can occur when duplicate RIDs are created in the DC. After a RID flexible single-master operations DC is restored, it tries to check its RID flexible single-master operations ownership. But it returns TRUE even before init sync with another DC has finished. Because of this, when the RID flexible single-master operations DC is restored, it may use old RID pool values, and it can cause the restored RID flexible single-master operations DC to begin issuing duplicate SIDs.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to obtain the latest Windows 2000 service pack
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