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My VPN connection worked well, but since an update, it didn't work.

Here my syslog :

Sep  8 21:25:25 ultra NetworkManager[1113]: <info> Starting VPN service 'pptp'...
Sep  8 21:25:25 ultra NetworkManager[1113]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 8516
Sep  8 21:25:25 ultra NetworkManager[1113]: <info> VPN service 'pptp' appeared; activating connections
Sep  8 21:25:25 ultra NetworkManager[1113]: <info> VPN plugin state changed: init (1)
Sep  8 21:25:25 ultra NetworkManager[1113]: <info> VPN plugin state changed: starting (3)
Sep  8 21:25:25 ultra NetworkManager[1113]: <info> VPN connection 'VPNisem' (Connect) reply received.
Sep  8 21:25:25 ultra pppd[8520]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
Sep  8 21:25:25 ultra pppd[8520]: pppd 2.4.5 started by root, uid 0
Sep  8 21:25:25 ultra pppd[8520]: Using interface ppp0
Sep  8 21:25:25 ultra pppd[8520]: Connect: ppp0 <--> /dev/pts/3
Sep  8 21:25:25 ultra NetworkManager[1113]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Sep  8 21:25:25 ultra NetworkManager[1113]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Sep  8 21:25:25 ultra pptp[8523]: nm-pptp-service-8516 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
Sep  8 21:25:25 ultra NetworkManager[1113]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
Sep  8 21:25:25 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'
Sep  8 21:25:25 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
Sep  8 21:25:25 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
Sep  8 21:25:26 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
Sep  8 21:25:26 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
Sep  8 21:25:26 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 29696).
Sep  8 21:25:39 ultra pppd[8520]: MS-CHAP authentication failed: 
Sep  8 21:25:39 ultra pppd[8520]: CHAP authentication failed
Sep  8 21:25:39 ultra pppd[8520]: Connection terminated.
Sep  8 21:25:39 ultra avahi-daemon[649]: Withdrawing workstation service for ppp0.  
Sep  8 21:25:39 ultra NetworkManager[1113]: <warn> VPN plugin failed: 1
Sep  8 21:25:39 ultra NetworkManager[1113]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Sep  8 21:25:39 ultra pptp[8523]: nm-pptp-service-8516 warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error
Sep  8 21:25:39 ultra pptp[8523]: nm-pptp-service-8516 warn[decaps_hdlc:pptp_gre.c:216]: pppd may have shutdown, see pppd log
Sep  8 21:25:39 ultra pptp[8532]: nm-pptp-service-8516 log[callmgr_main:pptp_callmgr.c:234]: Closing connection (unhandled)
Sep  8 21:25:39 ultra pptp[8532]: nm-pptp-service-8516 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
Sep  8 21:25:39 ultra pptp[8532]: nm-pptp-service-8516 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
Sep  8 21:25:39 ultra NetworkManager[1113]: <warn> VPN plugin failed: 1
Sep  8 21:25:39 ultra pppd[8520]: Exit.
Sep  8 21:25:39 ultra NetworkManager[1113]: <info> VPN plugin state changed: stopped (6)
Sep  8 21:25:39 ultra NetworkManager[1113]: <info> VPN plugin state change reason: 0
Sep  8 21:25:39 ultra NetworkManager[1113]: <info> Policy set 'PROUT' (wlan0) as default for IPv4 routing and DNS.
Sep  8 21:25:39 ultra NetworkManager[1113]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Sep  8 21:25:45 ultra NetworkManager[1113]: <info> VPN service 'pptp' disappeared
Sep  8 21:25:54 ultra NetworkManager[1113]: <warn> nl_recvmsgs() error: (-33) Dump inconsistency detected, interrupted

I searched a lot but I don't understand anything to the issue, this is a real big problem for my work...

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