In the eventviewer on an Exchange 2013 you might notice an error being reported every 60 seconds with Event ID 1121, MSExchange Replication Service.
Log Name: Application
Source: MSExchange Mailbox Replication
Date: 26-9-2017 11:43:14
Event ID: 1121
Task Category: Request
The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error.
Request GUID: '4c037387-462c-446f-855d-1a4a9f4769bc'
Database GUID: 'f76ac2d8-bf20-4646-88a1-5f9161f5f312'
Error: Database 'f5c17f94-0b61-472e-9908-048b145e740c' doesn't exist..
Check if there are any open mailbox move requests, export requests, import requests of migration batches. If there are any open requests remove or complete these if there are no open requests you can fix the error manually using the following cmdlet:
Remove-MoveRequest -MoveRequestQueue "f76ac2d8-bf20-4646-88a1-5f9161f5f312" -MailboxGuid "4c037387-462c-446f-855d-1a4a9f4769bc"
Where the -MoveRequestQueue is the Database GUID and the -MailboxGuid is the Request GUID from the event message.
The event errors should stop immediately. However you might notice that you are getting the error from multiple mailboxes (Different Request GUID id’s in event message). And you should therefore repeat this for each mailbox error.
I hope this was informative. For questions or comments you can always give a reaction in the comment section or contact me: