MikeK61 Thanks for your help. I have saved the file in a home folder, I have put the information of the gateway, certificate (PEM file), username and password (I show it first in NordVPN and then copy to the configuration) and put IP4 and IP6 as auto.
When I try to connect, it keeps on trying for several seconds and finally it says that the server is not responding... (connection time expired). I am sure that the gateway is correct. I have tried with another server (e.g. de1070 -> IP: 194.233.96.17:1194) but exactly the same.
Could you please export just one of your connections, clear the passwords (if available) and send it to me, please? It has to be just a configuration problem. Maybe one of the options in VPN->Erweitert has to be selected or something...
I can connect to the server de1070/de1072 without any problem with the terminal using sudo openvpn de1070.nordvpn.com.udp.ovpn
(not as normal user) and entering the same username and password as before. But with the Network-Manager is not working and the server cannot be reached.
Thanks for the help!