How to fix “The directory service was unable to allocate a relative identifier. [ERROR_DS_NO_RIDS_ALLOCATED (0x2010)]” – Error Code 8208


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Error Code 8208

Error code Error Code 8208 is a common Windows issue that typically arises from “The directory service was unable to allocate a relative identifier. [ERROR_DS_NO_RIDS_ALLOCATED (0x2010)]”.

Overview

This article addresses the issue described as “The directory service was unable to allocate a relative identifier. [ERROR_DS_NO_RIDS_ALLOCATED (0x2010)].” With error code Error Code 8208, this issue can hinder system performance. Here are steps to resolve it.

Identifying the Problem

Error Code 8208 occurs when the Active Directory cannot assign a unique identifier (RID) to a security principal, such as a user or group. This can be caused by:

  • Invalid RID pool configuration
  • Insufficient free RIDs in the domain
  • Replication issues between domain controllers

Common Fixes

1. Check RID Pool Configuration:

  • Verify the SID History attribute of the domain’s root domain object (DDO) is configured correctly.
  • Ensure there are no empty RID pools in the domain.

2. Reconcile RID Master:

  • Identify the RID Master role holder by running “ntdsuttil roles” on domain controllers.
  • Force replication from the RID Master to other domain controllers using “repadmin /syncall /Adeverything.”

3. Increase RID Block Size:

  • Use the AD Schema MMC snap-in to increase the RID block size for the domain.
  • Only do this if there is less than 25% of free RIDs remaining in the domain.

Advanced Troubleshooting

1. Check Event Viewer:

  • Review the Application and System logs for events related to RID allocation or replication.

2. Use RID Manager Tool:

  • Install the RID Manager tool from Microsoft.
  • Use the tool to check RID pool usage and identify any issues.

3. Rebuild RID Pool:

  • As a last resort, consider rebuilding the RID pool. This is a complex process that should only be performed by experienced administrators.

Conclusion

By following these steps, you can resolve Error Code 8208 and ensure the smooth functioning of your Active Directory. To prevent future occurrences:

  • Monitor RID pool usage regularly.
  • Keep domain controllers up to date and replicated.
  • Train administrators on proper user and group management practices.