Il giorno lun, 06/03/2017 alle 12.25 +0800, Ed Greshko ha scritto:
One bugzilla suggested that if the l2tp packages were installed gnome-shell may not work without a logout/login or reboot. My testing didn't show that to be the case but may still be worth the try.
After reboot the error disappeared and the connection go on...
Another thing, which should not happen, is the file /usr/libexec/nm-l2tp-auth-dialog had its mod changed. It should be executable. So, you should verify this as well.
It is executable, and now, after reboot, work.