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After server upgrade free disk space WMI sensors dont work




We did in place upgrade in our prtg server 2012 r2 to 2019. After upgrade all free disk sensor gone red except prtg server itself. We have snapshot we can go back to 2012 but 2012 support will finished middle of the year.

When I check other servers logs, all of them has this error logs:

The server-side authentication level policy does not allow the user domain\prtgadmin SID (S-1-5-21-1926350-7946-111-11941) from address xx.xx.xx.xx to activate DCOM server. Please raise the activation authentication level at least to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY in client application.

prtgadmin account added to domain admin and domain users group

I changed dcom settings to packet integrity as well on of our servers but still did not work.

Today DCOM hardening update released so we cant change registry setting, patched that update and tried again but no luck.



What can we do about them to turn them back to green again? Any ideas?

prtg sensor wmi

Created on Mar 15, 2023 10:11:08 AM

2 Replies



Same problem here, WMI Terminal Services (Windows 2008+) stop working, i've tried to increase the DCOM security but some prtg probes are installed on Hyper V hosts and i can't reboot easily

Created on Mar 16, 2023 11:30:23 AM




the best way would be to install all updates on both the probe, and the target systems. This should fix the DCOM hardening issue.

Created on Mar 22, 2023 9:48:24 AM by  Arne Seifert [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.