This article applies as of PRTG 21
Remote monitoring of specific performance counters
The PerfCounter Custom sensor can monitor a set of Windows performance counters that you can individually define. You can find available performance counters on your system via PerfMon as outlined in this article: How can I find out the names of available Performance Counters?.
If your probe with the PerfCounter Custom sensor runs on a different server than the performance counters that you want to monitor, there might be an issue with remote access.
On the PRTG core server system, try to remotely access the counters with PerfMon. If you can see some system counters (for example, processor information or SQL server), but not the desired performance counters, we recommend that you manually start Performance Counter DLL Host (perfhost.exe).
This Windows service enables remote users and 64-bit processes to query performance counters provided by 32-bit DLLs. It does not run by default, so that only local users and 32-bit processes are able to query performance counters provided by 32-bit DLLs.
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Where are my performance counters?
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