VPN Zugang zu CISCO-Zugang schlägt fehl

Hallo

Ich versuche gerade von meinem virtuellen XUBUNTU 14.04 (falls von Belang: läuft in Virtualbox) auf einen Cisco-Router-VPN-Zugang zu connecten.
Der Zugang ist analog den Settings zu einem funktionierenden Windows7 angelegt, doch nach einigem Gerödel passiert original nix.
Im syslog steht dazu

<pre>
Jan 12 14:30:34 virtualxubuntu pppd[3889]: Connection terminated.
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jan 12 14:30:34 virtualxubuntu pppd[3889]: Exit.
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: <warn> VPN plugin failed: 1
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: <warn> VPN plugin failed: 1
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: <info> VPN plugin state changed: stopped (6)
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: <info> VPN plugin state change reason: 0
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: <info> Policy set 'Kabelnetzwerkverbindung 1' (eth0) as default for IPv4 routing and DNS.
Jan 12 14:30:34 virtualxubuntu NetworkManager[3345]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Jan 12 14:30:40 virtualxubuntu NetworkManager[3345]: <info> VPN service 'pptp' disappeared
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <info> Starting VPN service 'pptp'...
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 3952
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <info> VPN service 'pptp' appeared; activating connections
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <info> VPN plugin state changed: init (1)
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <info> VPN plugin state changed: starting (3)
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <info> VPN connection 'cudgel' (Connect) reply received.
Jan 12 14:31:27 virtualxubuntu pppd[3954]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
Jan 12 14:31:27 virtualxubuntu pppd[3954]: pppd 2.4.5 started by root, uid 0
Jan 12 14:31:27 virtualxubuntu pppd[3954]: Using interface ppp0
Jan 12 14:31:27 virtualxubuntu pppd[3954]: Connect: ppp0 <--> /dev/pts/11
Jan 12 14:31:27 virtualxubuntu pptp[3957]: nm-pptp-service-3952 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Jan 12 14:31:27 virtualxubuntu NetworkManager[3345]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
Jan 12 14:31:36 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'
Jan 12 14:31:36 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
Jan 12 14:31:36 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
Jan 12 14:31:37 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
Jan 12 14:31:37 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
Jan 12 14:31:37 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 18362).
Jan 12 14:31:58 virtualxubuntu pppd[3954]: LCP: timeout sending Config-Requests
Jan 12 14:31:58 virtualxubuntu pppd[3954]: Connection terminated.
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: <warn> VPN plugin failed: 1
Jan 12 14:31:58 virtualxubuntu pppd[3954]: Modem hangup
Jan 12 14:31:58 virtualxubuntu pptp[3957]: nm-pptp-service-3952 warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error
Jan 12 14:31:58 virtualxubuntu pptp[3957]: nm-pptp-service-3952 warn[decaps_hdlc:pptp_gre.c:216]: pppd may have shutdown, see pppd log
Jan 12 14:31:58 virtualxubuntu pppd[3954]: Exit.
Jan 12 14:31:58 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[callmgr_main:pptp_callmgr.c:234]: Closing connection (unhandled)
Jan 12 14:31:58 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
Jan 12 14:31:58 virtualxubuntu pptp[3972]: nm-pptp-service-3952 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: message repeated 2 times: [ <warn> VPN plugin failed: 1]
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: <info> VPN plugin state changed: stopped (6)
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: <info> VPN plugin state change reason: 0
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: <info> Policy set 'Kabelnetzwerkverbindung 1' (eth0) as default for IPv4 routing and DNS.
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Jan 12 14:31:58 virtualxubuntu NetworkManager[3345]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jan 12 14:32:04 virtualxubuntu NetworkManager[3345]: <info> VPN service 'pptp' disappeared
</pre>

So wie es mir scheint findet er kein Device ppp0? Sehe ich das richtig? Wie kann ich das beheben?

Oder liegt es an etwas anderem?

Danke für Eure Hilfe.
Johannes