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:

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	2121
Event Source	MSExchange ADAccess
Alert Type	Warning
Rule Path	Microsoft Exchange Server/Exchange 2010/Common Components/Active Directory Access
Rule Name	The Exchange Active Directory Provider couldn't contact a domain controller in the domain, but it could resolve the name.

Explanation

This Warning event indicates that the Active Directory Provider could not connect to one or more domain controllers in the domain specified in the event description. This event may occur if one or both of the following conditions are true:

The host records that map Fully Qualified Domain Name (FQDN) of the domain controllers to their IP addresses are missing or contain incorrect addresses.
The domain controllers identified by DNS query are not working or not reachable on the network.

User Action

To resolve this warning, perform 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 domain controller specified in the event description is correctly registered on the DNS server. For more information, see the following topics:
- Troubleshooting Active Directory Related DNS Problems
- DNS Support for Active Directory Tools and Settings
Review other related Warning and Error events in the Application log. These related events may provide more information about the root cause of this warning.

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.