What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

SPN issues with LastWindowsUpdateSensor



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

prtg windowsupdatesstatus wmi

Created on May 5, 2021 9:08:01 AM

Last change on May 5, 2021 10:50:46 AM by  Felix Wiesneth [Paessler Support]

2 Replies

Accepted Answer



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

Created on May 5, 2021 10:55:02 AM

Last change on May 5, 2021 11:13:37 AM by  Felix Wiesneth [Paessler Support]



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

Created on May 5, 2021 6:42:29 PM by  Felix Wiesneth [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.