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CentOS 7 Problems / Re: Polkit error - GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed

« on: June 04, 2022, 06:18:10 PM »

On centos 7, there are instances where you get the error Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)

This usually happens when trying to restart a systemd service.

The workaround is as follows:

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groupadd -g 23 nohidproc
usermod -a -G nohidproc polkitd
mount -o remount,rw,hidepid=2,gid=nohidproc /proc
systemctl restart polkit

Add the following in /etc/fstab as well

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echo "proc /proc proc defaults,hidepid=2,gid=nohidproc 0 0" >> /etc/fstab
After mount the new mountpoint

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mount -a

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systemctl restart polkit
Done.


https://www.awaludin.net/how-to-fix-gdbus-errororg-freedesktop-policykit1-error-failed-centos-7/