L2TP plugin with IPSec PSK it is completely unusable because:
1) ipsec service doesn't start automatically, you have to enable it with systemctl
2) ipsec doesn't find *.secret files (the plugin doesn't generate it)
3) ipsec.conf generated by the plugins contains "VERSION 2" line incompatible with libreswan
4) if you insert manually a proper *.secret file in /etc/ipsec.d (enables it in /etc/ipsec.conf and removing "VERSION 2") the plugins fails with
<warn> VPN connection 'VPN' failed to connect: 'Possible error in IPSec setup.'.
<warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
and ipsec log doesn't show any error or warn message.
Selinux: disabled.
Please fix it..