This article was previously published under Q283257
The Exchange system attendant does not start. The following events are recorded in the event log.
Event Type: Information Event Source: MSExchangeSA Event Category: General description: Microsoft Exchange System Attendant is initializing 'DSACCESS.DLL'.
Event Type: Error Event Source: MSExchangeDSAccess Event Category: None Event ID: 2071 Description: Process MAD.EXE" (PID=####). All the remote Domain Controller Servers in use are not responding.
Event Type: Error Event Source: MSExchangeSA Event Category: General Event ID: 1005 Description: Unexpected error An unknown error has occurred. Facility: Win32 ID no: c0070810 Microsoft Exchange System Attendant occurred.
This problem occurs because the system account no longer has access to the Server container in Active Directory sites.
Verify that the domain controllers are visible in Active Directory Sites and Services. If they are not visible, check the state of those domain controllers and Active Directory replication.
Ensure that the Exchange Service account or Local System account have rights to those containers where the domain controllers exist. Generally, the System account should be listed in the permission list of these containers.
Check if the Authenticated Users group have Read rights on those two objects. By default, authenticated users should have Read rights.