I can confirm this is a general problem for all IPv4 dialogues such as this one. Starting from the console doesn't really give any useful information, aside from some debugging about connecting to a network, when I configure the VPN I just get:
** (nm-connection-editor:2864): WARNING **: Invalid setting VPN: ca ** (nm-connection-editor:2864): WARNING **: Invalid setting VPN: cert ** (nm-connection-editor:2864): WARNING **: Invalid setting VPN: key
(these errors appear when loading the dialogue, not when the settings are saved).
I can confirm this is a general problem for all IPv4 dialogues such as this one. Starting from the console doesn't really give any useful information, aside from some debugging about connecting to a network, when I configure the VPN I just get:
** (nm-connection- editor: 2864): WARNING **: Invalid setting VPN: ca editor: 2864): WARNING **: Invalid setting VPN: cert editor: 2864): WARNING **: Invalid setting VPN: key
** (nm-connection-
** (nm-connection-
(these errors appear when loading the dialogue, not when the settings are saved).