I use Openvpn and it works great.
However sometimes I need to connect using built-in VPN mechanisms like L2TP or PPtP.
WIth L2TP I am stuck on host certificate – during installation its ask me for a certificate password – I followed instructions and there are screenshots wher U are asked for a host certificate password – but during host certificate export check box for password is not active
With PPTP I managed to connect and it worked, but only for a while.
Just after reboot I could connect and I was able to see in the loggers (pppd, pptpd, radiusd) whole communication with RADIUS and functionality was exectly as I expected, but after a while unfortunately pppd stopped sending requests to radius