Topic Last Modified: 2010-04-21

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

Long running LDAP operations/Min

Sample Interval


Server Role

Ex14. Common

Critical Error Threshold


Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Domain Controller

Rule Name

LDAP long running operations - sustained for 5 minutes - Red(>100).


The LDAP Search Time performance counter shows the number of Lightweight Directory Access Protocol (LDAP) operations per minute that took longer than the specified threshold. The default threshold is 15 seconds. When an LDAP operation takes longer than the specified threshold to complete, it is considered a long running operation.

This alert indicates that there were 100 or more long-running LDAP operations per minute for 5 minutes. This alert may be caused by performance problems on your domain controllers or network congestion.

User Action

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

  • Ensure that the network performance between the Microsoft Exchange Server computer and the domain controllers it uses is not the bottleneck.

  • Ensure that the domain controllers Exchange is using are not experiencing performance problems. You can investigate CPU usage, as well as disk and memory bottlenecks, on your Active Directory directory service servers.

  • Consider using a dedicated Exchange server and a global catalog server for the expansion of dynamic distribution groups and large distribution groups.

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.