Topic Last Modified: 2010-03-31

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager includes a performance data collection engine that is used to query performance counter objects on computers running Exchange 2010. For this Operations Manager rule, data is collected by using the performance counter specified in the Details table.

To review the value of the performance counter that generated this alert, in Operations Manager, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.


Product Name


Product Version

14.0 (Exchange 2010)

Object Name

MSExchange ADAccess Domain Controllers

Counter Name

LDAP Searches timed out per minute

Instance Name


Sample Interval


Server Role

Ex14. Common

Warning Threshold


Rule Path

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

Rule Name

LDAP Search Timeouts - sustained for 5 minutes - Yellow(>10).


The LDAP Searches Timed Out Per Minute performance counter shows the number of LDAP search requests that timed out during the last minute. The average value should be less than 10 and the maximum value should not exceed 20.

This alert indicates that more than ten LDAP searches per minute timed out for five minutes. This can be caused by a network connectivity loss between the Exchange Server server and the Active Directory domain controller, a problem with the domain controller computer, or severe performance problems. 

User Action

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

  • Verify network connectivity between the Exchange Server server and its associated domain controllers.

  • Verify that the associated domain controllers are available.

  • Verify that the associated domain controllers are not experiencing severe performance problems. You can investigate CPU usage, as well as disk and memory bottlenecks, on your Active Directory servers.

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

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.