Topic Last Modified: 2010-02-15

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:

From the Operations Console, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.
From the Operations Console, double-click this alert, and then click the Alert Context tab. Review the logged events that meet the criteria of this Operations Manager alert.

Details

Product Name	Exchange
Product Version	14.0 (Exchange 2010)
Event ID	2122
Event Source	MSExchange ADAccess
Alert Type	Warning
Rule Path	Microsoft Exchange Server/Exchange 2010/Common Components/Active Directory Access
Rule Name	An error occurred when the Domain Name System (DNS) was queried for domain entries.

Explanation

This event indicates that an error occurred when Domain Name System (DNS) was queried for service resource (SRV) records for the specified domain. The domain controllers from the specified domain will not be used by DSAccess. You should investigate the issue and fix it. As long as there is sufficient capacity in usable domain controllers in other domains, there will not be mail flow interruption. If the event contains the name of the local domain, topology discovery cannot be completed and mail flow will be interrupted.

This behavior may occur if the required resource records in DNS are missing or incorrect.

User Action

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

Verify that the required SRV and A resource records exist in DNS by using the Nslookup command-line tool. For more information about how to use Nslookup, see Microsoft Knowledge Base article 200525, Using NSlookup.exe.

Verify connectivity, and then verify that the domain controller is running.
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..
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.