I recently migrated my PRTG Server installation from Amazon to Azure, and whilst it might be unrelated, I'm using full disclosure.
When I try to add a new WMI sensor - on any of my servers it comes back with the following error: Could not create the sensor WMI Service on device <DEVICENAME> (127.0.0.1).
Could not validate sensor preconditions
I have other WMI sensors that are working fine, and even when I try to add them again I get this error.
I also get this error when trying to add wmi sensors on any of my other servers.
PRTG Info: PRTG Version PRTG Network Monitor 18.104.22.16896 Auto-Update Status [12/07/2015 11:40:11 AM] Downloaded version (22.214.171.12496) is not newer than your current version (126.96.36.19996). Operating System Windows Server 2012 (6.2.2 Build 9200 ), 1 CPUs (Single x64 Model 45 Step 7), code page "Windows-1252", on HyperV Server Time 14.07.2015 07:58:19 (UTC+10:00)