Hi Mark, > When attempting to enable a L2TP VPN connection via Network > Manager if the connection fails then an error message is popped > up briefly saying "Activation of network connection failed" but > no diagnostics are made available indicating what the problem > might be, either immediately or for example in the settings app.
This is a limitation of all NetworkManager VPN plugins when it comes to debugging. The NetworkManager-l2tp README.md file has info on how to debug, see: https://github.com/nm-l2tp/NetworkManager-l2tp In particular, do the following: sudo journalctl --no-hostname _SYSTEMD_UNIT=NetworkManager.service + SYSLOG_IDENTIFIER=pppd -e Cheers, Doug
