Topic Last Modified: 2010-01-28

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 Availability

Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Client Access/Information Worker

Rule Name

An exception occurred while attempting to locate a Client Access server to handle the request.


This Error event indicates that a failure occurred while locating the Microsoft Exchange Client Access server that retrieves Schedule+ Free Busy information for the e-mail address specified in the event description. This event may occur for multiple reasons.

Note   This event occurs when the diagnostic logging level of Availability Service is set to Low. For more information about how to change diagnostic logging levels, see Change Logging Levels for Exchange Processes.

User Action

For more information about the root cause of this error, do one or more of the following:

  • Increase the diagnostic logging level on the Availability Service and Availability Service General counter of the MSExchange Availability performance object. You can increase logging by running the following Exchange Management Shell commands:

    Set-EventLogLevel "MSExchange Availability\Availability Service" -Level High

    Set-EventLogLevel "MSExchange Availability\Availability Service General" -Level High

    For more information about increasing diagnostic logging levels, see Change Logging Levels for Exchange Processes.

  • Review the Application event log for related events. Events that occur immediately before and after this event may provide more information about the root cause of this error.

    Important   After you have completed troubleshooting this issue, return logging to the default level by running the following commands:

    Set-EventLogLevel "MSExchange Availability\Availability Service" -Level Lowest

    Set-EventLogLevel "MSExchange Availability\Availability Service General" -Level Lowest

  • If this event seems to be causing mail flow interruptions or other problems in the Exchange environment, contact Microsoft Product Support. For information about how to contact support, visit the Microsoft Help and Support Web site.