Topic Last Modified: 2010-01-25

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

MSExchange ADAccess

Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Active Directory Access

Rule Name

The Exchange Active Directory Provider couldn't find an available domain controller in the domain.


This Error event indicates that all domain controllers in the domain specified in the event description are down or unreachable. This event may occur for one or more of the following reasons:

  • Network issues prevent the Active Directory provider from finding an available domain controller.

  • The DNS server is configured incorrectly.

  • Active Directory sites are configured incorrectly. This would be a problem only for topologies that include multiple Active Directory sites.

User Action

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

  • Use the Ping or PathPing command-line tools to test basic connectivity. Use Ping to isolate network hardware problems and incompatible configurations. Use PathPing to detect packet loss over multiple-hop trips. For more information, see Microsoft Knowledge Base article 325487, How to troubleshoot network connectivity problems.

  • Make sure that all the domain controllers in the domain are registered correctly on the DNS server. For more information, see Microsoft Knowledge Base article 247811, How Domain Controllers Are Located in Windows.

  • If you have multiple Active Directory sites, make sure that they are configured correctly. For more information, see Creating an Active Directory Site for Exchange Server.

  • Run the Dcdiag command-line tool to test domain controller health. To do this, run dcdiag /s:<Domain Controller Name> at a command prompt on the Exchange server. Use the output of Dcdiag to discover the root cause of any failures or warnings that it reports. For more information, see Dcdiag Overview at the Windows Server TechCenter.

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.