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You receive the warning "Computer Monitoring Error" in Windows Home Server 2011 after you install Update Rollup 2

After you updated a server that is running Windows Home Server 2011 with the Update Rollup 2 for Home Server 2011, you receive the warning "Computer Monitoring Error" in the Home Server 2011 Launchpad or Dashboard. You receive this warning every 30 minutes.

This happens after the system installs Update Rollup 2. You find the following exceptions in the SharedServiceHost-AlertServiceConfig.log file.
120222.003152.9814: NetworkHealthEngine: Exception happened in Microsoft.WindowsServerSolutions.NetworkHealth.Engine.BinaryActionDefinition: System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.WindowsServerSolutions.Servicing.Alerts.MacClientUpdateCondition.Run(IActionContext context)
Additionally, this can occur when you have removed a previously connected network computer from the server.

The log file is located in the following folder:
%Programdata%\Microsoft\Windows Server\Logs
You do not receive a warning reminding you to update your Mac client connector. There is no effect on other alerts or product features.
This occurs when one of the Alert evaluation components in Home Server 2011 tries to iterate through the records of all client computers in the network. It throws an unhandled exception when the component accesses the record of a client computer that was removed.

File information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To install this hotfix, you must have Windows Home Server 2011 installed on the server.

Registry information

To apply the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Update replacement information

This hotfix does not replace a previously released hotfix.

Removal information

To remove this hotfix, use the Add or Remove Programs item in Control Panel. Additionally, you must uninstall the client-side package (KB 2686872) from all client computers.

Hotfix file information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. The dates and times may also change when you perform certain operations on the files.
For all supported x64-based versions of Windows Home Server 2011
File nameFile versionFile sizeDateTimePlatform
For more information see the following document on the Social TechNet webpage:
Computer Monitoring Error Home Server 2011 UR2

Article ID: 2686857 - Last Review: 04/11/2012 16:44:00 - Revision: 3.0

  • Windows Home Server 2011
  • kbexpertiseinter kbhotfixserver kbprb kbbug kbsurveynew kbautohotfix KB2686857