How to fix “The object and parent must be of the same type either both masters or both replicas. [ERROR_DS_CANT_MIX_MASTER_AND_REPS (0x208B)]” – Error Code 8331

Overview

In this article, we’ll focus on resolving the issue described as: “The object and parent must be of the same type either both masters or both replicas. [ERROR_DS_CANT_MIX_MASTER_AND_REPS (0x208B)]”. This error, identified by the error code Error Code 8331, can impede your system’s performance, and here’s how you can fix it.

Identifying the Problem

Error Code 8331 occurs when you try to mix masters and replicas in a single object’s hierarchy. To rectify this error, ensure both the object and its parent are either masters or replicas.

Common Fixes

Fix 1: Use the Same Type for Object and Parent
– Identify the object’s parent.
– Check the object’s type (master or replica).
– Modify the object or parent’s type to match (if necessary).

Fix 2: Verify Object and Parent are in the Same Domain
– Ensure the object and parent belong to the same domain.
– If not, move the object to the same domain as its parent.

Fix 3: Ensure Object and Parent are in the Same Site
– Confirm that both the object and its parent are in the same Active Directory site.
– If not, move one to match the other.

Advanced Troubleshooting

Fix 4: Check Domain Controller Replication
– Verify that replication between domain controllers is functional.
– If not, resolve any replication issues.

Fix 5: Reconfigure FSMO Roles
– Transfer necessary FSMO roles.
– Ensure the FSMO roles are consistently configured across all domain controllers.

Fix 6: Use Ntdsutil to Fix Replication
– Open the command prompt as an administrator.
– Type: ntdsutil and press Enter.
– Select “Active Directory Connections” and “Connect to Server”.
– Enter the server’s FQDN and credentials.
– Type: repadmin /options to view replication options.
– Use appropriate options to fix replication issues.

Conclusion

Error Code 8331 can be resolved by ensuring the object and parent share the same type (master or replica), are in the same domain and site, and by verifying that domain controller replication is functioning properly. Applying these fixes should restore your system’s performance. Remember, maintaining a well-configured Active Directory environment is crucial to prevent this error in the future.