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:

From the Operations Console, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.
From the Operations Console, double-click this alert, and then click the Alert Context tab. Review the logged events that meet the criteria of this Operations Manager alert.

Details

Product Name	Exchange
Product Version	14.0 (Exchange 2010)
Event ID	4018
Event Source	MSExchange Availability
Alert Type	Warning
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.

Explanation

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.