Topic Last Modified: 2010-01-27

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 ActiveSync

Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Client Access/ActiveSync

Rule Name

A setting in the Web.Config file was not valid and has been reset to the default value.


This Warning event indicates that the value specified for the Internet Information Services (IIS) setting referenced in the event description is not valid. The value has been changed to the default value. Microsoft Exchange ActiveSync will use the default settings until the next time that the server that is running Microsoft Exchange is restarted.

Caution   We recommend that you use default values unless an alternative value has been recommended by Microsoft Product Support Services.

User Action

To make sure that this warning does not occur again, follow these steps to manually change the settings to the default settings:

  1. Start Internet Information Services (IIS) Manager.

  2. In the console tree, click Web Sites, and then click Default Web Site.

  3. Right-click Microsoft-Server-ActiveSync, and then click Properties.

  4. On the ASP.NET tab, click Edit Configuration.

  5. On the General tab, under Application settings, configure the setting specified in the event description to the default value.

    Note   You must restart Internet Information Services (IIS) by using the command iisreset/noforce for these changes to take effect.

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.