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:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source

MSExchange ADAccess

Alert Type


Rule Path

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

Rule Name

The maximum number of allowed processes are using DSAccess. No additional processes can use the API. Restart the Active Directory Topology service.


This Error event indicates that more than 32 processes have tried to access the DSAccess memory cache. Under ordinary operating conditions, it is uncommon for more than 32 processes to try to access the DSAccess memory cache. This event may occur when one or more processes that use the DSAccess memory cache exit unexpectedly without releasing the memory cache.

User Action

To resolve this error, restart the Microsoft Exchange Active Directory Topology service. If the error persists, restart the Exchange server that logged this event.

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.