repadmin Troubleshooting

Diagnosing and Resolving Replication Issues with Repadmin

Common Replication Error Codes and Resolutions

• "Replication failure: 80000000" – Generic HRESULT error. Use repadmin /showrepl to identify the affected DC and partition.
• "Replication failure: 8009030C" – LDAP_SERVER_CANNOT_CONTACT_SERVER. Verify network connectivity between DCs and ensure DNS resolution is correct. Use repadmin /replicate <DC> <Partition> to force replication.
• "Replication failure: 8009030A" – LDAP_ERROR_UNSUPPORTED_CONTROL. Check for invalid controls in replication requests. Use repadmin /forcereplication to resolve persistent issues.

Step-by-Step Repadmin Command Workflow

1. Check Replication Status
   

   repadmin /showrepl  
   

2. Output: Displays replication status, latency, and errors. Look for * symbols indicating conflicts, failures, or inconsistencies in replication status.

3. Force Replication Between DCs
   

   repadmin /replicate <SourceDC> <TargetDC> <Partition>  
   

4. Example: repadmin /replicate DC1 DC2 "DC=Domain,DC=com"

5. Use Case: Resolve one-way replication failures by manually triggering replication.

6. Synchronize All Partitions
   

   repadmin /syncall <DC> * /A  
   

7. Example: repadmin /syncall DC1 * /A

8. Use Case: Force full synchronization of all partitions on a specific DC.

9. Force Global Replication
   

   repadmin /forcereplication <DC> <Partition>  
   

10. Example: repadmin /forcereplication DC1 "DC=Domain,DC=com"
11. Use Case: Urgently resolve replication delays or conflicts across the domain.

Troubleshooting Tips

• Use repadmin /showrepl first to identify the root cause.
• Combine /replicate and /forcereplication for targeted fixes.
• Always verify results with repadmin /showrepl after resolving errors.