Solarwinds – An exception occurred during polling processes. Error: Invalid class – Using WMI or RPC to poll

in Solarwinds SAM I was getting this error when trying to check for a running Process using Solarwinds Agents + WMI

After a bit of digging I found that on the computer in question, Opening windows Performance Monitor would give the error

Unable to add these counters:

\Memory\Available MBytes
\Memory\% Committed Bytes In Use
\Memory\Cache Faults/sec
\Memory\Cache Faults/sec
\PhysicalDisk(*)\%Idle Time
\PhysicalDisk(*)\Avg. Disk Queue Length
\Network Interface(*)\Bytes Total/sec”

The problem is that some of the WMI Querys have been disabled on the computer so will need to be reenabled
Following this technet article : https://social.technet.microsoft.com/wiki/contents/articles/19374.windows-performance-monitor-unable-to-add-these-counters.aspx fixed my issue

Short instructions on how to fix

Open CMD as administrator
CD C:\Windows\System32
lodctr /r
CD C:\Windows\SysWOW64
lodctf /r
lodctf /q
This will query the Performance Metrics library’s installed on the machine
Copy this list in a notepad and check for items that are disabled
For each disabled entry you will need to run the command lodctr /e:<provider name>

Once done you should be able to use your monitor in Solarwinds

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