Event ID - 16645

Event Id16645
SourceSAM
DescriptionThe maximum account identifier allocated to this domain controller has been assigned. The domain controller has failed to obtain a new identifier pool. A possible reason for this is that the domain controller has been unable to contact the master domain controller. Account creation on this controller will fail until a new pool has been allocated. There may be network or connectivity problems in the domain, or the master domain controller may be offline or missing from the domain. Verify that the master domain controller is running and connected to the domain.
Event InformationDuring the creation of a large number of enabled user objects, you may receive the above Event 16645 error message. 
CAUSE :
As part of an enabled user-object-creation process, a security principal is allocated from the RID pool. If that number of enabled user-object creations is greater than the local RID pool and a request to the RID Master is unable to return a new pool in time, this symptom occurs. 
RESOLUTION:
To resolve this issue, point ADMA to the RID Master. For more details click the link to Microsoft articles, given below.</p>
Reference Links Event ID 16645 During a Large ADMA Import

HOW TO: Specify a Specific Domain Controller per Domain in Active Directory Management Agent

Catch threats immediately

We work side-by-side with you to rapidly detect cyberthreats
and thwart attacks before they cause damage.

See what we caught

Did this information help you to resolve the problem?

Yes: My problem was resolved.
No: The information was not helpful / Partially helpful.