Conexão VPN falhou no Ubuntu 14.04

Question

De alguma forma, após as atualizações do sistema na noite passada, não consigo me conectar à VPN (Cisco open-vpn).

Eu tracei sudo tail -f /var/log/syslog

Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> Starting VPN service 'vpnc'...
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN service 'vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 5025
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN service 'vpnc' appeared; activating connections
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN plugin state changed: starting (3)
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN connection 'Vonage VPN' (Connect) reply received.
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tun1, iface: tun1)
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tun1, iface: tun1): no ifupdown configuration found.
Dec 15 12:25:18 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <warn> /sys/devices/virtual/net/tun1: couldn't determine device driver; ignoring...
Dec 15 12:25:19 aftab-ThinkPad-Edge-E431 NetworkManager[1104]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/tun1, iface: tun1)
Dec 15 12:25:19 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <warn> VPN plugin failed: 1
Dec 15 12:25:19 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN plugin state changed: stopped (6)
Dec 15 12:25:19 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN plugin state change reason: 0
Dec 15 12:25:19 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> Policy set 'Noduco2' (wlan0) as default for IPv4 routing and DNS.
Dec 15 12:25:19 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Dec 15 12:25:23 aftab-ThinkPad-Edge-E431 wpa_supplicant[1192]: wlan0: CTRL-EVENT-SCAN-STARTED 
Dec 15 12:25:24 aftab-ThinkPad-Edge-E431 NetworkManager[1104]: <info> VPN service 'vpnc' disappeared
Dec 15 12:25:24 aftab-ThinkPad-Edge-E431 wpa_supplicant[1192]: nl80211: send_and_recv->nl_recvmsgs failed: -33
Dec 15 12:27:23 aftab-ThinkPad-Edge-E431 wpa_supplicant[1192]: wlan0: CTRL-EVENT-SCAN-STARTED 
Dec 15 12:27:24 aftab-ThinkPad-Edge-E431 wpa_supplicant[1192]: nl80211: send_and_recv->nl_recvmsgs failed: -33

Qual pode ser a possível razão para isso?

    

Answer 1

Sua questão principal está aqui:

SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tun1, iface: tun1)
SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tun1, iface: tun1): no ifupdown configuration found.

Quando o serviço VPN é iniciado, ele adiciona uma interface de rede tun1 e tenta configurá-lo. No entanto, não há configuração para tun1 em /etc/network/interfaces , portanto, o serviço VPN pára por aí.

Agora, não sei o suficiente sobre VPNs no Linux para dizer exatamente o que fazer. Talvez tenha sido tun0 antes, e outro tun0 tenha sido adicionado à máquina, então ele aumentou em um? Talvez você possa apenas configurar tun1 em /etc/network/interfaces ?