Comment # 1 on bug 1009034 from Alexander Naumov

The same problem in Leap 15.0 Beta.

NetworkManager doesn't accept PEM- and CRT-certificates generated by RADIUS.
The same certificates are accepted by NetworkManager on Kubuntu 17.10 and
everything works well there.

> nmcli con reload
> nmcli con up NAME_OF_MY_802.1x_CONNECTION
After that it ask (again and again) for password. Correct password is set in
/etc/NetworkManager/system-connectioins/NAME_OF_MY_802.1x_CONNECTION.

Using plasma applet (instead of console configuration) doesn't help.

Tested in KDE Plasma 5.12.