Allowing the Internet Guest Account to access Performance Counters on Windows XP

I had a lot of trouble with this, so I’m posting the solution for all to benefit.  Thanks to this blog ( for the solution.

My test code is as follows:

$cmd = "typeperf \"\\\\".getenv("HTTP_HOST")."\\processor(_Total)\\% Processor Time\" -sc 1";
echo $cmd . "<br/>";
echo exec($cmd, $result=array());

IIS is set up to use the IUSR_MACHINENAME (Internet Guest Account).

1. Set permission for IUSR to read and execute c:\windows\system32\cmd.exe (WARNING: THIS IS A SECURITY RISK! Do not do this on a production server)

2. Set permission for IUSR to read and execute c:\windows\system32\typeperf.exe

3. Set permission for IUSR to read the Perflib registry key located at “HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Perflib”

Now, you should be able to read performance counters through your IIS web server.  Note, there are probably better ways to handle step 1.  If you know of a better method, please suggest one in the comments section and I’ll update this entry.

Hope this helps!

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