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[Solved] AADSync/AADConnect : Unable to connect to the Synchronization Service Manager

Sometimes when you logon to a Synchronization server, you’re not able to start the Synchronization Service Manager then check your membership of the local ADSyncAdmins and/or ADSyncOperators group.


Unable to connect to the Synchronization Service.

Some possible reasons are:

  1. The service is not started.
  2. Your account is not a member of a required security group.

See the Synchronization Service documentation for details


Check if the Microsoft Azure AD Sync Service is started

Check is your account is a member of the local ADSyncAdmins and/or ADSyncOperators group,if not, add the current user to this group and logoff and logon again !