Comment # 2 on bug 1194603 from Martin Wilck

I have updated TW to the latest code base (20220110), and I can't reproduce
this issue.

The policy for the "fi.w1.wpa_supplicant1" are defined in
/etc/dbus-1/system.d/wpa_supplicant.conf. The policy allows only root to
communicate with  
"fi.w1.wpa_supplicant1". 

See https://dbus.freedesktop.org/doc/dbus-daemon.1.html

So, unless NetworkManager is not running as root, this should work, and it does
on my system.

You said on IRC that this error was first observed after the update of
wpa_supplicant:

* Mon Jan 10 2022 Johannes Segitz <jsegitz@suse.com>
- Added hardening to systemd service(s) (bsc#1181400). Modified:
  * wpa_supplicant.service

There were some security-related changes in this releas in the systemd service
file for wpa_supplicant:

ProtectSystem=full
ProtectHome=read-only
ProtectHostname=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectKernelLogs=true
ProtectControlGroups=true
RestrictRealtime=true

But I can't see how those would affect the behavior on dbus, which is
controlled by a different file, see above.

Please verify that the issue disappears when you revert the update of (just)
wpa_supplicant (see https://download.opensuse.org/history/), and occurs again
if you apply the update again.

Please provide journalctl output for the connection attempts, and describe
steps to reproduce (what are you doing to activate the network connection?)