WMI & Citrix VDA not working anymore

Hi Guys,

I have a strange behavior since end of January and the support cannot help me anymore. My WMI sensors (mostly disk logical disk sensor v2) do not work after some time.

I have some Citrix VDA servers (Windows 2019 up to dates - One month delay, Citrix 1912 CU6 and CU7). The only thing that I have with WMI checks is the disk sensors, built by PRTG directly. It helps us to monitor mainly I/O, Read/Write time...

But after some random times (it could be few hours / few days), the WMI sensors stop working with these errors:

• Connection could not be established (code: PE015)
• The WMI request has unrecoverably timed out. To resolve this issue, consider pausing or deleting the sensor. For more information, see https://helpdesk.paessler.com/en/support/solutions/articles/1093. (code: PE051)

If I restart the WMI windows service on my VDA servers, it works again. If I tried to use the WMI tester during the outage, the program just hangs and after 30 minutes gives me a random error. If I do the same query during the outage from the same user and from the probe with powershell (Get-WmiObject -Namespace "root\cimv2" -Class Win32_PerfFormattedData_PerfDisk_LogicalDisk for exemple), it works well all the time.

The support does not understand what happen and want me to use only snmp. however SNMP does not monitor I/O and stuff like this.

I don't know what I can do and why PRTG does not want to investigate further espacially when it's working well with Powershell.

We built a complete new Probe, tried this workaround (https://support.microsoft.com/en-us/topic/kb5004442-manage-changes-for-windows-dcom-server-security-feature-bypass-cve-2021-26414-f1400b52-c141-43d2-941e-37ed901c769c) but nothing works.

Do you encounter the same thing or am i alone on this one ?

Thanks for your feedback.