Performance Monitor Sensors for intermittently available counters?

The only way to resolve this issue would be to have it auto-acknowledge or you could set it up to automatically pause. Unfortunately this would apply to all errors not only to a specific error, there is no way to have notifications trigger for specific errors.

The only way that I can think of that you could set this up in PRTG is to use a script to retrieve this data and there you would be able to define what an error is or not and you could have the script return 0 value when the user is disconnected.

More information about the custom script sensors can be found under Setup->PRTG API->Custom Sensors.

Thanks Greg.

A Powershell script worked well for this purpose and hasn't caused any performance issues.

For the benefit of anyone else trying to monitor RDP bandwidth I'll include the script. This is a simple example only, no proper error handling and has the machine to monitor hard-coded.

$ErrorActionPreference= 'silentlycontinue'

Try 
{

$result= (Get-Counter -counter "Terminal Services Session(RDP-Tcp $args)\Total Compressed Bytes" -ComputerName [SERVER NAME]).CounterSamples[0].CookedValue

"$result" + ":Session $args OK"

}

Catch
{
"0:Session $args Unavailable"
}

Thanks so much for the input to the community!