How can I specify "No such instance" (SNMP error # 223) as Normal/Ok?

Hi Willi,

PRTG will always evaluate the "No such name" as an error condition and it will not be possible to differentiate between the status.

It will still be possible to perform the check with a custom sensor and process the results. This could be possible by creating an if-condition to return the value if available and to return 0 for everything else.

You can have a look at this article which describes this process with NetSNMP and PowerShell.

This is a simple example based on the linked example above:

cls
$var = cmd /c "snmpget.exe" -c "public" -v 2c -Oqv "%%HOSTNAME%%" .1.3.6.1.2.1.31.1.1.1.18.15 2>&1

if ($LASTEXITCODE -ne 0){
    $upsstatus = 0
   }else{
        $status = $var.replace(" ","")
        $upsstatus = switch -regex ($status){
        "Other Thing" {"2"; break}
	"High Temperature" {"1"; break}
        default {"0"}
        }
}

Write-Host "<prtg>"
Write-Host "<result>"
Write-Host "<value>$($upsstatus)</value>"
Write-Host "</result>"
Write-Host "</prtg>"

Essentially the "relevant" part of the script is 2>&1 that "catches" the error and then the ($LASTEXITCODE -ne 0) captures any issues with the execution and returns 0 when there an errors. This is intended to be used with lookups:

• Value interpretation (aka Lookups)

Best regards, Felix