For me, before editing the connection, NetworkManager crashed with a
segfault and restarted after attempting to connect with a faulty VPN
connection. The same may be what happens to you.
However, I can add a new connection with gnome-control-center or
nm-connection-editor (without using any “connection file”; GNOME asks
me for the sudo password though) and then I fill in the gateway field.
I can then use for example nmtui to activate the connection.
I noticed I have openconnect in my config.scm’s system packages, but I
believe it is not relevant.
I use:
(network-manager-service-type config =>
(network-manager-configuration
(inherit config)
(dns "dnsmasq")
(vpn-plugins (list network-manager-openconnect))))
dnsmasq is probably not required, but I do not know.
Regards,
Florian
