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Имам проблем с настройката на VPN Ubuntu 16.04. Просто отказва да се свърже по какъвто и да е повод. Предположих, че може да съм объркал конфигурацията но след толкова опити и неуспех се съмнявам проблема да е в това.

tail -f /var/log/syslog

ми дава:

Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.1910] audit: op="connection-activate" uuid="e79a2ebd-db40-4709-8e02-45b8afb6e9c4" name="OranaVPN" pid=1971 uid=1000 result="success"
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.1997] vpn-connection[0xbeb3f0,e79a2ebd-db40-4709-8e02-45b8afb6e9c4,"OranaVPN",0]: Started the VPN service, PID 13994
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.2133] vpn-connection[0xbeb3f0,e79a2ebd-db40-4709-8e02-45b8afb6e9c4,"OranaVPN",0]: Saw the service appear; activating connection
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.3053] vpn-connection[0xbeb3f0,e79a2ebd-db40-4709-8e02-45b8afb6e9c4,"OranaVPN",0]: VPN connection: (ConnectInteractive) reply received
Nov 23 22:09:20 Gr337 NetworkManager[886]: ** Message: pppd started with pid 14003
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.3379] vpn-connection[0xbeb3f0,e79a2ebd-db40-4709-8e02-45b8afb6e9c4,"OranaVPN",0]: VPN plugin: state changed: starting (3)
Nov 23 22:09:20 Gr337 pppd[14003]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Nov 23 22:09:20 Gr337 NetworkManager[886]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Nov 23 22:09:20 Gr337 NetworkManager[886]: ** Message: nm-pptp-ppp-plugin: (plugin_init): initializing
Nov 23 22:09:20 Gr337 pppd[14003]: pppd 2.4.7 started by root, uid 0
Nov 23 22:09:20 Gr337 NetworkManager[886]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 3 / phase 'serial connection'
Nov 23 22:09:20 Gr337 pppd[14003]: Using interface ppp0
Nov 23 22:09:20 Gr337 pppd[14003]: Connect: ppp0 <--> /dev/pts/18
Nov 23 22:09:20 Gr337 NetworkManager[886]: Using interface ppp0
Nov 23 22:09:20 Gr337 NetworkManager[886]: Connect: ppp0 <--> /dev/pts/18
Nov 23 22:09:20 Gr337 NetworkManager[886]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
Nov 23 22:09:20 Gr337 NetworkManager[886]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.3436] manager: (ppp0): new Generic device (/org/freedesktop/NetworkManager/Devices/4)
Nov 23 22:09:20 Gr337 pptp[14008]: nm-pptp-service-13994 log[main:pptp.c:350]: The synchronous pptp option is NOT activated
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.3500] devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Nov 23 22:09:20 Gr337 NetworkManager[886]: <info>  [1479935360.3500] device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Nov 23 22:09:51 Gr337 pppd[14003]: LCP: timeout sending Config-Requests
Nov 23 22:09:51 Gr337 NetworkManager[886]: LCP: timeout sending Config-Requests
Nov 23 22:09:51 Gr337 NetworkManager[886]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 11 / phase 'disconnect'
Nov 23 22:09:51 Gr337 NetworkManager[886]: Connection terminated.
Nov 23 22:09:51 Gr337 pppd[14003]: Connection terminated.
Nov 23 22:09:51 Gr337 NetworkManager[886]: ** Message: Terminated ppp daemon with PID 14003.
Nov 23 22:09:51 Gr337 NetworkManager[886]: <error> [1479935391.3757] platform-linux: do-change-link[5]: failure changing link: failure 19 (No such device)
Nov 23 22:09:51 Gr337 NetworkManager[886]: <warn>  [1479935391.3758] device (ppp0): failed to disable userspace IPv6LL address handling
Nov 23 22:09:51 Gr337 NetworkManager[886]: <info>  [1479935391.3774] devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Nov 23 22:09:51 Gr337 NetworkManager[886]: <info>  [1479935391.3779] vpn-connection[0xbeb3f0,e79a2ebd-db40-4709-8e02-45b8afb6e9c4,"OranaVPN",0]: VPN service disappeared
Nov 23 22:09:51 Gr337 NetworkManager[886]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 1 / phase 'dead'
Nov 23 22:09:51 Gr337 NetworkManager[886]: Terminating on signal 15
Nov 23 22:09:51 Gr337 NetworkManager[886]: Child process /usr/sbin/pptp 93.184.205.16 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-13994 (pid 14006) terminated with signal 15
Nov 23 22:09:51 Gr337 NetworkManager[886]: Modem hangup
Nov 23 22:09:51 Gr337 NetworkManager[886]: ** Message: nm-pptp-ppp-plugin: (nm_exit_notify): cleaning up
Nov 23 22:09:51 Gr337 pppd[14003]: Terminating on signal 15
Nov 23 22:09:51 Gr337 pppd[14003]: Child process /usr/sbin/pptp 93.184.205.16 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-13994 (pid 14006) terminated with signal 15
Nov 23 22:09:51 Gr337 pppd[14003]: Modem hangup
Nov 23 22:09:51 Gr337 pppd[14003]: Exit.

Това което съм опитъл до момента е да спра IPv6 протокола както и да създам файл

/etc/modules-load.d/netfilter.conf

със следното съдържание

nf_nat_pptp
nf_conntrack_pptp
nf_conntrack_proto_gre

Re-install на Network-manager също не помогна.

Не съм чел целия лог, но наскоро имах подобен проблем - пробвай да активираш опцията Point-to-point (MPPE) encryption в настройките за ВПН-а.

Функцията Point-to-point (MPPE) encryption е активна..

(https://s13.postimg.org/5r5qvgjlv/Screenshot_from_2016_11_24_08_21_25.png) ($2)