How can I troubleshoot «VPN Connection Failed»?
Is there anyway to get an error log for a failed VPN connection attempt? All I get is this notification and I have no idea where to go from there.
7 Answers 7
Log is written to /var/log/syslog .
Open gnome-terminal and do sudo tail -f /var/log/syslog
This will follow the file (prints to terminal new log messages).
Now try to connect to the vpn, the messages then will start showing in the terminal.
When you are done following the log just click Ctrl+c to quit tail.
One can add markers to the log by opening another terminal and doing something like that:
logger «. Starting VPN. «
thank you. my username / password were incorrect but all I got was «connection timed out». the logs told me everything I needed to know!
The new (systemd-)variant to get the logs is
journalctl -u NetworkManager.service Not only it is a variant, but it includes more information. Only thanks to looking via journalctl , I was able to find an issue with Window VPN. pppd[15094]: MS-CHAP authentication failed: E=649 No dialin permission
In Fedora and other systemd distro’s that do not have /var/log/syslog, the VPN logs can be accessed with «sudo journalctl -f»
I’d suggest that that isn’t really relevant as this is «askubuntu», but Ubuntu is migrating to systemd, too, and while they’ll probably always have /var/log/syslog (its existence is independent of systemd, and I doubt Fedora used it before systemd), journalctl is always the correct way to view the log on systemd.
What kind of VPN are you trying to establish?
Is it PPTP (Microsoft proprietary) or Cisco-compatible ?
The easiest way would be for you to run pptp (for PPTP) or vpnc (for Cisco) from a console and see the possible errors interactively.
I think that vpnc is quite straight forward, you just need to type in the necessary info (gateway ip, group name/pass, user name/pass).
I haven’t actually used a PPTP VPN, but some info about setting it up can be found here at cyberciti
Проблемы с VPN соединением Ubuntu
Проблема следующая, у меня в общаге доступен только интернет предоставляемый университетом и подключиться к нему можно только через vpn, на windows все работает хорошо, а на ubuntu никак не хочет устанавливаться соединение. Я создаю новое соединение через Network Manager: 
Потом прописываю логин, который мне выдали в универе и имя сервера, пароль опускаю, чтобы ввести при выполнении подключения, вычитал в гугле что иначе вообще работать не будет: 
Доп настройки такие: 
В результате при подключении получаю сообщение что соединение разорвано, т.к. vpn служба была остановлена. Вот логи, пробовал устанавливать соединение с подключенным wifi(раздавал с телефона) и без, инфа в логах при этом разная, но понять что не так самому не получается. Без wifi:
Nov 25 17:24:11 dicobi NetworkManager[936]: [1543141451.2162] audit: op="connection-activate" uuid="eb5caaec-41f0-44a8-b35d-70f7f7622e5f" name="VPN_TSU" pid=2062 uid=1000 result="success" Nov 25 17:24:11 dicobi NetworkManager[936]: [1543141451.2207] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: Started the VPN service, PID 5227 Nov 25 17:24:11 dicobi NetworkManager[936]: [1543141451.2294] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: Saw the service appear; activating connection Nov 25 17:24:11 dicobi gnome-session[1852]: Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Nov 25 17:24:18 dicobi NetworkManager[936]: [1543141458.8835] keyfile: update /etc/NetworkManager/system-connections/VPN_TSU (eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU") Nov 25 17:24:18 dicobi NetworkManager[936]: [1543141458.8918] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN connection: (ConnectInteractive) reply received Nov 25 17:24:18 dicobi NetworkManager[936]: [1543141458.8958] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN connection: failed to connect: 'не удалось найти IP-адрес шлюза PPTP VPN «vpdn.tsu.ru» (-3)' Nov 25 17:24:18 dicobi NetworkManager[936]: [1543141458.8974] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN plugin: state changed: stopped (6) Nov 25 17:24:18 dicobi NetworkManager[936]: [1543141458.8985] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN service disappeared Nov 25 17:26:43 dicobi NetworkManager[936]: [1543141603.4339] audit: op="connection-activate" uuid="eb5caaec-41f0-44a8-b35d-70f7f7622e5f" name="VPN_TSU" pid=2062 uid=1000 result="success" Nov 25 17:26:43 dicobi NetworkManager[936]: [1543141603.4380] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: Started the VPN service, PID 5400 Nov 25 17:26:43 dicobi NetworkManager[936]: [1543141603.4467] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: Saw the service appear; activating connection Nov 25 17:26:43 dicobi gnome-session[1852]: Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Nov 25 17:26:49 dicobi NetworkManager[936]: [1543141609.4287] keyfile: update /etc/NetworkManager/system-connections/VPN_TSU (eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU") Nov 25 17:26:49 dicobi NetworkManager[936]: [1543141609.4378] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN connection: (ConnectInteractive) reply received Nov 25 17:26:49 dicobi NetworkManager[936]: ** Message: pppd started with pid 5417 Nov 25 17:26:49 dicobi NetworkManager[936]: [1543141609.4489] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN plugin: state changed: starting (3) Nov 25 17:26:49 dicobi pppd[5417]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded. Nov 25 17:26:49 dicobi NetworkManager[936]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded. Nov 25 17:26:49 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (plugin_init): initializing Nov 25 17:26:49 dicobi pppd[5417]: pppd 2.4.7 started by root, uid 0 Nov 25 17:26:49 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 3 / phase 'serial connection' Nov 25 17:26:49 dicobi pppd[5417]: Using interface ppp0 Nov 25 17:26:49 dicobi NetworkManager[936]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed Nov 25 17:26:49 dicobi NetworkManager[936]: Using interface ppp0 Nov 25 17:26:49 dicobi NetworkManager[936]: Connect: ppp0 /dev/pts/7 Nov 25 17:26:49 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish' Nov 25 17:26:49 dicobi pppd[5417]: Connect: ppp0 /dev/pts/7 Nov 25 17:26:49 dicobi NetworkManager[936]: [1543141609.4602] manager: (ppp0): new Generic device (/org/freedesktop/NetworkManager/Devices/12) Nov 25 17:26:49 dicobi pptp[5423]: nm-pptp-service-5400 log[main:pptp.c:350]: The synchronous pptp option is NOT activated Nov 25 17:26:49 dicobi NetworkManager[936]: [1543141609.4697] devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Nov 25 17:26:49 dicobi NetworkManager[936]: [1543141609.4706] device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found. Nov 25 17:26:49 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 1 'Start-Control-Connection-Request' Nov 25 17:26:49 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_disp:pptp_ctrl.c:781]: Received Start Control Connection Reply Nov 25 17:26:49 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_disp:pptp_ctrl.c:815]: Client connection established. Nov 25 17:26:50 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 7 'Outgoing-Call-Request' Nov 25 17:26:50 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_disp:pptp_ctrl.c:900]: Received Outgoing Call Reply. Nov 25 17:26:50 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_disp:pptp_ctrl.c:939]: Outgoing call established (call ID 10129, peer's call ID 17426). Nov 25 17:26:50 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 6 / phase 'authenticate' Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (get_credentials): passwd-hook, requesting credentials. Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (get_credentials): got credentials from NetworkManager-pptp Nov 25 17:26:51 dicobi pppd[5417]: CHAP authentication succeeded Nov 25 17:26:51 dicobi NetworkManager[936]: CHAP authentication succeeded Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 8 / phase 'network' Nov 25 17:26:51 dicobi pppd[5417]: MPPE required but peer negotiation failed Nov 25 17:26:51 dicobi NetworkManager[936]: MPPE required but peer negotiation failed Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 10 / phase 'terminate' Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish' Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 11 / phase 'disconnect' Nov 25 17:26:51 dicobi NetworkManager[936]: Connection terminated. Nov 25 17:26:51 dicobi pppd[5417]: Connection terminated. Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: Terminated ppp daemon with PID 5417. Nov 25 17:26:51 dicobi NetworkManager[936]: [1543141611.5554] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN plugin: failed: connect-failed (1) Nov 25 17:26:51 dicobi NetworkManager[936]: [1543141611.5555] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN plugin: state changed: stopping (5) Nov 25 17:26:51 dicobi NetworkManager[936]: [1543141611.5568] platform-linux: do-change-link[13]: failure changing link: failure 19 (Нет такого устройства) Nov 25 17:26:51 dicobi NetworkManager[936]: [1543141611.5568] device (ppp0): failed to disable userspace IPv6LL address handling Nov 25 17:26:51 dicobi NetworkManager[936]: [1543141611.5575] vpn-connection[0x237b270,eb5caaec-41f0-44a8-b35d-70f7f7622e5f,"VPN_TSU",0]: VPN service disappeared Nov 25 17:26:51 dicobi NetworkManager[936]: [1543141611.5653] devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 1 / phase 'dead' Nov 25 17:26:51 dicobi NetworkManager[936]: Child process /usr/sbin/pptp 82.200.70.12 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-5400 (pid 5420) terminated with signal 15 Nov 25 17:26:51 dicobi NetworkManager[936]: ** Message: nm-pptp-ppp-plugin: (nm_exit_notify): cleaning up Nov 25 17:26:51 dicobi pppd[5417]: Child process /usr/sbin/pptp 82.200.70.12 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-5400 (pid 5420) terminated with signal 15 Nov 25 17:26:51 dicobi pppd[5417]: Exit. Nov 25 17:26:51 dicobi pptp[5423]: nm-pptp-service-5400 warn[decaps_hdlc:pptp_gre.c:220]: short read (-1): Input/output error Nov 25 17:26:51 dicobi pptp[5423]: nm-pptp-service-5400 warn[decaps_hdlc:pptp_gre.c:232]: pppd may have shutdown, see pppd log Nov 25 17:26:51 dicobi pptp[5435]: nm-pptp-service-5400 log[callmgr_main:pptp_callmgr.c:245]: Closing connection (unhandled) Nov 25 17:26:51 dicobi pptp[5435]: nm-pptp-service-5400 log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 12 'Call-Clear-Request' Nov 25 17:26:51 dicobi pptp[5435]: nm-pptp-service-5400 log[call_callback:pptp_callmgr.c:84]: Closing connection (call state)