You can't start the User Profile Synchronization service

Symptoms

You can't start the User Profile Synchronization service in Microsoft SharePoint Server 2013. The service shows a status of either Starting or Stopped. Additionally, the following error entry is logged in the ULS log:

OWSTIMER.EXE (0x2B80) 0x3370 SharePoint Portal Server User Profiles g144 Unexpected Failed to set the new Service Broker on database <SyncDB> on server <ServerName>. Exception: The operation cannot be performed on database <SyncDB> because it is involved in a database mirroring session or an availability group. Some operations are not allowed on a database that is participating in a database mirroring session or in an availability group.  ALTER DATABASE statement failed.  ALTER DATABASE statement failed.    
OWSTIMER.EXE (0x2B80) 0x3370 SharePoint Portal Server User Profiles 9sip High UserProfileApplication.SynchronizeMIIS: Failed to configure MIIS post database, will attempt during next rerun. Exception: System.Data.SqlClient.SqlException (0x80131904): The operation cannot be performed on database <SyncDB> because it is involved in a database mirroring session or an availability group. Some operations are not allowed on a database that is participating in a database mirroring session or in an availability group.  ALTER DATABASE statement failed.  ALTER DATABASE statement failed.       
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)       
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)       
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)       
at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)       
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)       
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()       
at Microsoft.Office.Server.Data.SqlSession.ExecuteNonQuery(SqlCommand command)       
at Microsoft.Office.Server.Administration.SynchronizationDatabase.EnableServiceBroker()  
at Microsoft.Office.Server.Administration.UserProfileApplication.SetupSynchronizationService(ProfileSynchronizationServiceInstance profileSyncInstance)    
ClientConnectionId:<Id>  Error Number:1468,State:1,Class:16.    
OWSTIMER.EXE (0x2B80) 0x3370 SharePoint Portal Server User Profiles 9i1u Medium UserProfileApplication.SynchronizeMIIS: End setup for 'User Profile Service Application'.        

Cause

The issue occurs if the synchronization database is involved in a database mirroring session or an availability group.

Resolution

To resolve the issue, follow these steps:

  1. Remove the synchronization database from the database mirroring session or the availability group.
  2. Stop the User Profile Synchronization service.
  3. Restart the User Profile Synchronization service.
  4. Restore the synchronization database to the availability group.