Comment 7 for bug 668874

I can confirm the same behaviour as Hendy Irawan.

Sometimes it doesn't, sometimes it does. This also started happening quite recently.

On Failure:
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: <info> Starting VPN service 'org.freedesktop.NetworkManager.vpnc'...
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' started (org.freedesktop.NetworkManager.vpnc), PID xxx
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' appeared, activating connections
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: <info> VPN plugin state changed: 3
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: <info> VPN connection 'xxxxxxxx' (Connect) reply received.
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tun0, iface: tun0)
Nov 26 09:04:53 thomas-laptop NetworkManager[978]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tun0, iface: tun0): no ifupdown configuration found.
Nov 26 09:04:53 thomas-laptop modem-manager: (net/tun0): could not get port's parent device
Nov 26 09:04:53 thomas-laptop kernel: [ 1207.614311] tun0: Disabled Privacy Extensions
Nov 26 09:05:26 thomas-laptop avahi-daemon[982]: Withdrawing workstation service for tun0.
Nov 26 09:05:26 thomas-laptop NetworkManager[978]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/tun0, iface: tun0)
Nov 26 09:05:26 thomas-laptop NetworkManager[978]: <warn> VPN plugin failed: 1
Nov 26 09:05:26 thomas-laptop NetworkManager[978]: <info> VPN plugin state changed: 6
Nov 26 09:05:26 thomas-laptop NetworkManager[978]: <info> VPN plugin state change reason: 0
Nov 26 09:05:26 thomas-laptop NetworkManager[978]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Nov 26 09:05:26 thomas-laptop NetworkManager[978]: <info> Policy set 'Auto eth0' (eth0) as default for IPv4 routing and DNS.