How to fix Warning :There is less than 3% available RIDs in the current pool.

Question

I ran DCDIAG across our Active Directory regional infrastructure, which includes one PDC and 10 other additional domain controllers at different sites. I received a warning: “There is less than 3% available RIDs in the current pool.”

Running DCDIAG on the other domain controllers showed no warnings and an adequate amount of the pool. I am not interested in increasing the number of the current pool, so I transferred the RID Master role to another domain controller. This resulted in no RID warnings, but the problem has not been resolved.

Below is the result of dcdiag /test:RidManager /v:

Starting test: RidManager * Available RID Pool for the Domain is 10100 to 1073741823 * DC.Mycompany.local is the RID Master * DsBind with RID Master was successful * rIDAllocationPool is 5100 to 5599 * rIDPreviousAllocationPool is 1100 to 1599 * rIDNextRID: 1588 * Warning: There is less than 3% available RIDs in the current pool

I have forced replication and rebooted the domain controller, but the issue persists. Please advise me if transferring all FSMO roles to a new, fresh domain controller is a good idea, or recommend best practices.

Thank you so much.

Answer 1

Hello POURIA JOUDAKI,

Thank you for posting in Q&A forum.

Transferring all FSMO roles to a new, fresh domain controller is not necessary in this case.

Here is a similar thread with marked answer (explanation), you can read it.

https://learn.microsoft.com/en-us/answers/questions/437421/server-2003-dcdiag-reports-warning-there-is-less-t

I hope the information above is helpful.

If you have any questions or concerns, please feel free to let us know.

Best Regards,

Daisy Zhou

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Answer 2

Thank you so much for the feedback, and apologies for the late response.

I assumed nothing will happen and RID pool on the specific DC will fetch the new pool.
Can I now bring back the RID Master to the PDC or its better to keep it on the new additional DC? and please let me know, is there any way to force the specific DC to receive new pool?