Error Code 0x800421D6 Summary
Error 0x800421D6 is typically encountered within the context of Microsoft Exchange Server, specifically related to issues with Active Directory and Exchange databases. This error usually occurs during operations such as mailbox moves or database management tasks where there might be a problem with replication or synchronization between Active Directory and the Exchange store.
When dealing with this issue, it is important to understand that 0x800421D6 indicates an error related to “The object was not found in the Active Directory.” This can happen under various circumstances involving the interaction between Exchange Server and Active Directory, such as attempting to perform a mailbox move or database maintenance when there are inconsistencies or missing entries within the directory service.
Given its nature, this error is commonly seen during administrative tasks like moving mailboxes between databases, creating or modifying objects in the Exchange organization that rely on accurate synchronization with Active Directory. It can also occur if there were recent changes made to user accounts or group policies affecting how these entities interact with Exchange Server.
Description and Common Scenarios for Error Code 0x800421D6
This error primarily occurs when performing operations within Microsoft Exchange Server that require interaction with Active Directory, such as mailbox moves and database maintenance tasks. A specific scenario where this issue might arise is during a mailbox move operation if the target server has not been properly synchronized or replicated with Active Directory. Another potential trigger for 0x800421D6 could be when attempting to create a new public folder hierarchy without ensuring that all referenced objects exist within both Exchange and Active Directory environments.
Additionally, errors like this often stem from underlying issues such as network connectivity problems between domain controllers and servers running Exchange services. If there are delays or failures in replicating changes across different AD sites, it may lead to inconsistencies that cause 0x800421D6 when trying to execute certain commands.
To diagnose further, one might check event logs on both the Exchange server and domain controllers for any signs of replication issues, configuration discrepancies, or other events leading up to when the error was first encountered. It’s also crucial to verify that all involved servers have the latest updates installed as outdated software can sometimes cause such synchronization problems.
Howto solve error code 0x800421D6
1. Begin by ensuring that there are no network connectivity issues between domain controllers and Exchange Server(s). Check firewall settings, ensure DNS is correctly configured for Active Directory replication, and confirm that necessary ports (like TCP 389/636) are open.
2. Review the event logs on both the Exchange server and AD DCs to look for any signs of synchronization problems or configuration discrepancies around the time the error occurred. Pay special attention to Event IDs related to Active Directory replication and Exchange health monitoring.
3. Verify that all involved servers have the latest updates installed, including Windows Server Updates and Microsoft Exchange Cumulative Updates, as outdated software can sometimes lead to such issues.
4. Use tools like Repadmin.exe or dcdiag.exe to manually check for any replication failures between domain controllers affecting the partition(s) used by Exchange. If problems are found, resolve them according to best practices (e.g., use ntdsutil to force replication).
5. Once synchronization is confirmed as being up-to-date across all relevant servers, retry the operation that initially resulted in 0x800421D6. For instance, if you were attempting a mailbox move, try initiating it again after addressing any identified issues.
6. If the error persists despite these steps, consider reaching out to Microsoft Support or consulting with an experienced Exchange administrator for further guidance and troubleshooting options specific to your environment.
7. In some cases, performing a full Active Directory synchronization from scratch might be necessary if there are extensive inconsistencies detected across multiple partitions. This should only be attempted as a last resort after exhausting all other diagnostic measures and ensuring proper backup procedures are in place.
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