I have a fully functional network connection via wifi and a network cable. I added three OpenVPN connections in the Zorin 17 VPN settings. They worked fine until they suddenly didn't. Now, every time I want to start an OpenVPN connection, an error message appears immediately:
Activation of network connection failed
This happens both wired and wireless.
When I make an new OpenVPN connection, that connection works. The others still generate the error though.
Thank you for the tips! I don't use Proton VPN, but I remember installing the Proton Mail Bridge app after I added the OpenVPN connections. The connections I added later, are still working. I think we can conclude that not only Proton VPN, but Proton Mail Bridge messes things up a bit too.