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 Search Time

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 Time - sustained for 5 minutes - Red(>100msec).


The LDAP Search Time performance counter shows the time in milliseconds (ms) that a Lightweight Directory Access Protocol (LDAP) search request takes to be fulfilled. The average value should be under 50 milliseconds. Maximum values should not exceed 100 ms. This alert indicates that responses to LDAP search requests have been exceeding 100 ms for five minutes.

High LDAP search latencies can be caused by high remote procedure call (RPC) latencies and by increasing queues. High LDAP search latencies generally indicate one of the following problems:

  • Performance problem with the network connection to the domain controller.

  • Performance problems with the domain controller itself.

User Action

To reduce the time it takes for LDAP searches, do one or more of the following:

  • Ensure that the network performance between the Exchange Server server and its associated domain controllers is not the bottleneck.

  • Monitor the Searches/sec performance counter to see if there is an unexpected surge in the number of searches Exchange is requesting from Active Directory.

  • Make sure that the associated domain controllers are not experiencing 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.