What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags




Hi Guys.

We have been looking and googling intensivly on help or "how to´s" to get PRTG to monitor specific Counters from PerfMon on an IIS server.

Long story short, we want to monitor #GC Handles w3wp .net CLR memory, but would like to be able to pick any perfmon counter and add it to a PRTG sensor.

We have 250 sensors to spare so looking to get detailed info from or IIS and SQL server by pointing out counters from Perfmon to a sensor and get them monitored.

Thanks for any help or feedback our search online will go on, but i hope we get this sorted soon .... screen getting foggy ;-)


iis perfmon performance-counters prtg wmi-iis

Created on Oct 22, 2014 10:38:30 AM

3 Replies



Just to clarify so i dont get a standard "copy and paste" from the manual of prtg.

We have created the custom WMI sensor and created the WQL script as follows ...

SELECT PercenttimeinGC FROM Win32_PerfRawData_NETFramework_NETCLRMemory

But the main problem is now something is missing because only value returned is 0.

adding _base has no effect , somehow PRTG needs to be pointed to en 4 instances of the w3wp.exe to get the GC from the IIS garden.

Cheers, any help would be greatly appreciated.

Created on Oct 23, 2014 6:12:26 AM




please use the same query with our WMI Tester and scan against the target IIS. Which result do you get in the WMI Tester?

best regards.

Created on Oct 23, 2014 8:02:35 AM by  Torsten Lindner [Paessler Support]



WMI tester also gives the reply of "0" , thats why i mean something is missing here.

While accessing Perfmon (.NET CLR Memory / % time in GC) returns allot of data and option to one or more instances. (This is what we want and must monitor with PRTG)

been trying to add 'where' statements to the WQL and the selecte statement without any luck.

Im beginning to doubt that monitoring this the PRTG is not possible with the current querie structure and we perhaps are looking at some longer scripts of sorts.

Created on Oct 23, 2014 8:12:58 AM

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.