There is a new plugin for l2tp connection. https://launchpad.net/~seriy-pr/+archive/network-manager-l2tp It would be great if developers realize GUI for it.
Source code for this plugin is there https://github.com/seriyps/NetworkManager-l2tp
*** This bug has been confirmed by popular vote. ***
In Fedora 18 (KDE Spin), as therer is no GUI for L2TP connection I use this command to access the internal GUI of NetworkManager: nm-connection-editor There you can create the L2TP VPN using it's own internal GUI.
Also I found that there is a package in Fedora repository with the same name. So it must be installed before using the above command. There is also a package, which is named "network-manager-applet". It contains an applet which can be used almost independent of the desktop. To use it, after installation I just used this command: nm-applet
(In reply to comment #4) Now you use Gnome Network Manager which is not relevant to this bug ;)
Hello! Sorry to be the bearer of bad news, but this project has been unmaintained for many years and I will be closing this bug. Please test again with the latest version and file a new bug in plasma-nm. Thank you!