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Windows Server 2003

Troubleshooting Microsoft .NET 2.0 and WMI perfmon counters

.NET 2.0 counters won’t show up in perfmon by default when using the /wmi switch.  They will show up in you just use regular perfmon but if you are trying to monitor .NET 2.0 counters via WMI, you are stuck.  Microsoft is aware of this and released 951683 to fix this issue.  You can request the hotfix from CSS here:

This hotfix is included with .NET 3.5 SP1 onward so if you have it installed, you shouldn’t experience this issue.  After installing the hotfix (does not require a reboot), just restart the WMI service and run this from command line:

winmgmt /resyncperf

which will resync counters with WMI.  Then open perfmon using “perfmon /wmi”  and you will see the missing counters. 

You can also use the wbemtest.exe utility to test and troubleshoot WMI related issues.  Just run this from command line:


Click the Connect button and change the very first field to “root\cimv2”. 


Then press Connect and then click Enum Classes on the next window.  Leave the superclass blank but change it to Recursive and press OK.  It will query every WMI class on the server and you can click on them to get further details.  This should help you tremendously if you write your own WQL queries! 🙂

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