Hello everybody,

On some of my servers (with SQL Server and/or Business Object installed on it), I'm unable to use the "LastWindowsUpdateSensor".

PSRemoting is enabled, I checked the SPNs and created the "5985" SPN entries.

I'm able to enter a PSSession with the "includeportinspn" option

On my PRTG sensor, the "include port in SPN" box is checked

I try to manually check with the sensor but I'm unable to find the good arguments

I tried this command (I got it from the sensor log) : LastWindowsUpdateSensor.exe -host=servername.myaddomain.tld -timeout=43198 -port=5985 -portinspn=1 -authmechanism=6 -debugfile="C:\ProgramData\Paessler\PRTG Network Monitor\Logs\sensors\Result of Sensor XXXX.log", but the return is the following : Object reference not set to an instance of an object.

The result is the same when I just specify "host" and "port"

Thank you for your precious help

Article Comments

The sensor is now working :

As a resolution, I :
- replaced FQDN with IP Address
- kept the "Include SPN" box checked
- kept the "Negotiate Authentication" box checked


May, 2021 - Permalink

Hi Alexandre,
I'm happy to hear that you get it working. Thank you for sharing your troubleshooting steps.

Kind regards

Felix Wiesneth - Team Tech Support


May, 2021 - Permalink