Topic Last Modified: 2010-05-03

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source


Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Mailbox/System Attendant

Rule Name

DSAccess returned an error during an Active Directory notification. System Attendant will try to perform the Active Directory notification at a later time.


This Error event indicates the Exchange server is unable to access a domain controller. This event commonly occurs when a domain controller is restarted, if that is the only domain controller in the site to which the Exchange server belongs. This event can also occur if your Domain Name System (DNS) configuration is incorrectly configured. 

User Action

To resolve this error, do one or more of the following:

  • The client Lightweight Directory Access Protocol (LDAP) connections should get re-established automatically, and the errors should go away after this re-establishment has taken place. We recommend that additional domain controllers be installed in the site to avoid such errors.

  • Make sure that both the primary and alternate DNS servers listed in the Exchange server IP Properties are running and have been configured properly.

  • Check the domain controller to ensure that it is running correctly. For example, make sure that it is not restarting unnecessarily.

  • If you are having difficulty resolving the issue, contact Microsoft Product Support. For information about contacting support, visit the Contact Us page of the Microsoft Help and Support Web site.

For more information about domain controllers and LDAP connections, refer to Windows documentation.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.