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 Preload Filter for the DN could not be parsed. This filter will not be used.


This Error event indicates that DSAccess search preload was configured in the Windows registry, but one of the entries in the PreloadFilters registry key could not be parsed. DSAccess search preloading enhances performance of the Exchange server and reduces the load on Active Directory.

This event may occur when the specified filter entry in the PreloadFilters registry key contains invalid characters or a misspelled attribute name.

User Action

To resolve this error, make sure that the filter specified in the PreloadFilters registry key is valid. For more information, see Microsoft Knowledge Base article 250572, XCON: Preloading and the DSAccess Cache.

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.