Public bug reported:

>From a few days I cannot connect via VPN, It worked from a few months

*sudo apt policy network-manager*

network-manager:
  Installed: 1.2.6-0ubuntu0.16.04.3
  Candidate: 1.2.6-0ubuntu0.16.04.3
  Versions:
 *** 1.2.6-0ubuntu0.16.04.3 500
        500 http://ftp.agh.edu.pl/ubuntu xenial-updates/main amd64 Packages
        500 http://ftp.agh.edu.pl/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1.1.93-0ubuntu4 500
        500 http://ftp.agh.edu.pl/ubuntu xenial/main amd64 Packages


*/var/sys/log*


Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.8520] audit: 
op="connection-activate" uuid="3872fc1d-94ce-465e-8d52-7bbeb3eb72fe" name="HS 
VPN" pid=13561 uid=1000 result="success"
Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.8706] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: 
Started the VPN service, PID 2396
Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.8815] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: Saw 
the service appear; activating connection
Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.9989] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
connection: (ConnectInteractive) reply received
Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: pppd started with pid 2405
Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0148] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state changed: starting (3)
Nov 14 10:46:08 hs pppd[2405]: Plugin 
/usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Nov 14 10:46:08 hs NetworkManager[1081]: Plugin 
/usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(plugin_init): initializing
Nov 14 10:46:08 hs pppd[2405]: pppd 2.4.7 started by root, uid 0
Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 3 / phase 'serial connection'
Nov 14 10:46:08 hs NetworkManager[1081]: nm_device_get_device_type: assertion 
'NM_IS_DEVICE (self)' failed
Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0226] manager: 
(ppp0): new Generic device (/org/freedesktop/NetworkManager/Devices/47)
Nov 14 10:46:08 hs pptp[2411]: nm-pptp-service-2396 log[main:pptp.c:350]: The 
synchronous pptp option is NOT activated
Nov 14 10:46:08 hs pppd[2405]: Using interface ppp0
Nov 14 10:46:08 hs NetworkManager[1081]: Using interface ppp0
Nov 14 10:46:08 hs pppd[2405]: Connect: ppp0 <--> /dev/pts/22
Nov 14 10:46:08 hs NetworkManager[1081]: Connect: ppp0 <--> /dev/pts/22
Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 5 / phase 'establish'
Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0391] devices 
added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0392] device added 
(path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration 
found.
Nov 14 10:46:39 hs pppd[2405]: LCP: timeout sending Config-Requests
Nov 14 10:46:39 hs NetworkManager[1081]: LCP: timeout sending Config-Requests
Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 11 / phase 'disconnect'
Nov 14 10:46:39 hs NetworkManager[1081]: Connection terminated.
Nov 14 10:46:39 hs pppd[2405]: Connection terminated.
Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: Terminated ppp daemon with 
PID 2405.
Nov 14 10:46:39 hs NetworkManager[1081]: <warn>  [1542188799.0566] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: failed: connect-failed (1)
Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0577] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state changed: stopping (5)
Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0579] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state changed: stopped (6)
Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0680] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state change reason: unknown (0)
Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0802] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
service disappeared
Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 1 / phase 'dead'
Nov 14 10:46:39 hs NetworkManager[1081]: Terminating on signal 15
Nov 14 10:46:39 hs NetworkManager[1081]: Modem hangup
Nov 14 10:46:39 hs pppd[2405]: Terminating on signal 15
Nov 14 10:46:39 hs pppd[2405]: Modem hangup
Nov 14 10:46:39 hs pptp[2291]: nm-pptp-service-2215 
log[pptp_read_some:pptp_ctrl.c:593]: read error: Bad file descriptor
Nov 14 10:46:39 hs kernel: [ 5539.540135] pptpcm[2291]: segfault at 
7f069f3a87b8 ip 0000000000406a87 sp 00007fff93e204a8 error 4 in 
pptp[400000+e000]
Nov 14 10:46:39 hs pppd[2405]: Child process /usr/sbin/pptp <VPN_GATE> 
--nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2396 (pid 2408) 
terminated with signal 15
Nov 14 10:46:39 hs NetworkManager[1081]: Child process /usr/sbin/pptp 
185.201.115.134 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2396 
(pid 2408) terminated with signal 15
Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_exit_notify): cleaning up
Nov 14 10:46:39 hs pppd[2405]: Exit.
Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.1150] devices 
removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Nov 14 10:46:39 hs NetworkManager[1081]: <error> [1542188799.1223] 
platform-linux: do-change-link[45]: failure changing link: failure 19 (Nie ma 
takiego urządzenia)
Nov 14 10:46:39 hs NetworkManager[1081]: <warn>  [1542188799.1223] device 
(ppp0): failed to disable userspace IPv6LL address handling
Nov 14 10:46:39 hs pptp[2446]: nm-pptp-service-2396 
log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 1 
'Start-Control-Connection-Request'

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1803316

Title:
  VPN connection is stopped

Status in network-manager package in Ubuntu:
  New

Bug description:
  From a few days I cannot connect via VPN, It worked from a few months

  *sudo apt policy network-manager*

  network-manager:
    Installed: 1.2.6-0ubuntu0.16.04.3
    Candidate: 1.2.6-0ubuntu0.16.04.3
    Versions:
   *** 1.2.6-0ubuntu0.16.04.3 500
          500 http://ftp.agh.edu.pl/ubuntu xenial-updates/main amd64 Packages
          500 http://ftp.agh.edu.pl/ubuntu xenial-security/main amd64 Packages
          100 /var/lib/dpkg/status
       1.1.93-0ubuntu4 500
          500 http://ftp.agh.edu.pl/ubuntu xenial/main amd64 Packages

  
  */var/sys/log*

  
  Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.8520] audit: 
op="connection-activate" uuid="3872fc1d-94ce-465e-8d52-7bbeb3eb72fe" name="HS 
VPN" pid=13561 uid=1000 result="success"
  Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.8706] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: 
Started the VPN service, PID 2396
  Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.8815] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: Saw 
the service appear; activating connection
  Nov 14 10:46:07 hs NetworkManager[1081]: <info>  [1542188767.9989] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
connection: (ConnectInteractive) reply received
  Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: pppd started with pid 
2405
  Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0148] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state changed: starting (3)
  Nov 14 10:46:08 hs pppd[2405]: Plugin 
/usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
  Nov 14 10:46:08 hs NetworkManager[1081]: Plugin 
/usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
  Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(plugin_init): initializing
  Nov 14 10:46:08 hs pppd[2405]: pppd 2.4.7 started by root, uid 0
  Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 3 / phase 'serial connection'
  Nov 14 10:46:08 hs NetworkManager[1081]: nm_device_get_device_type: assertion 
'NM_IS_DEVICE (self)' failed
  Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0226] manager: 
(ppp0): new Generic device (/org/freedesktop/NetworkManager/Devices/47)
  Nov 14 10:46:08 hs pptp[2411]: nm-pptp-service-2396 log[main:pptp.c:350]: The 
synchronous pptp option is NOT activated
  Nov 14 10:46:08 hs pppd[2405]: Using interface ppp0
  Nov 14 10:46:08 hs NetworkManager[1081]: Using interface ppp0
  Nov 14 10:46:08 hs pppd[2405]: Connect: ppp0 <--> /dev/pts/22
  Nov 14 10:46:08 hs NetworkManager[1081]: Connect: ppp0 <--> /dev/pts/22
  Nov 14 10:46:08 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 5 / phase 'establish'
  Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0391] devices 
added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
  Nov 14 10:46:08 hs NetworkManager[1081]: <info>  [1542188768.0392] device 
added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown 
configuration found.
  Nov 14 10:46:39 hs pppd[2405]: LCP: timeout sending Config-Requests
  Nov 14 10:46:39 hs NetworkManager[1081]: LCP: timeout sending Config-Requests
  Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 11 / phase 'disconnect'
  Nov 14 10:46:39 hs NetworkManager[1081]: Connection terminated.
  Nov 14 10:46:39 hs pppd[2405]: Connection terminated.
  Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: Terminated ppp daemon 
with PID 2405.
  Nov 14 10:46:39 hs NetworkManager[1081]: <warn>  [1542188799.0566] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: failed: connect-failed (1)
  Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0577] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state changed: stopping (5)
  Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0579] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state changed: stopped (6)
  Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0680] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
plugin: state change reason: unknown (0)
  Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.0802] 
vpn-connection[0x134c1c0,3872fc1d-94ce-465e-8d52-7bbeb3eb72fe,"HS VPN",0]: VPN 
service disappeared
  Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_phasechange): status 1 / phase 'dead'
  Nov 14 10:46:39 hs NetworkManager[1081]: Terminating on signal 15
  Nov 14 10:46:39 hs NetworkManager[1081]: Modem hangup
  Nov 14 10:46:39 hs pppd[2405]: Terminating on signal 15
  Nov 14 10:46:39 hs pppd[2405]: Modem hangup
  Nov 14 10:46:39 hs pptp[2291]: nm-pptp-service-2215 
log[pptp_read_some:pptp_ctrl.c:593]: read error: Bad file descriptor
  Nov 14 10:46:39 hs kernel: [ 5539.540135] pptpcm[2291]: segfault at 
7f069f3a87b8 ip 0000000000406a87 sp 00007fff93e204a8 error 4 in 
pptp[400000+e000]
  Nov 14 10:46:39 hs pppd[2405]: Child process /usr/sbin/pptp <VPN_GATE> 
--nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2396 (pid 2408) 
terminated with signal 15
  Nov 14 10:46:39 hs NetworkManager[1081]: Child process /usr/sbin/pptp 
185.201.115.134 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2396 
(pid 2408) terminated with signal 15
  Nov 14 10:46:39 hs NetworkManager[1081]: ** Message: nm-pptp-ppp-plugin: 
(nm_exit_notify): cleaning up
  Nov 14 10:46:39 hs pppd[2405]: Exit.
  Nov 14 10:46:39 hs NetworkManager[1081]: <info>  [1542188799.1150] devices 
removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
  Nov 14 10:46:39 hs NetworkManager[1081]: <error> [1542188799.1223] 
platform-linux: do-change-link[45]: failure changing link: failure 19 (Nie ma 
takiego urządzenia)
  Nov 14 10:46:39 hs NetworkManager[1081]: <warn>  [1542188799.1223] device 
(ppp0): failed to disable userspace IPv6LL address handling
  Nov 14 10:46:39 hs pptp[2446]: nm-pptp-service-2396 
log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 1 
'Start-Control-Connection-Request'

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