Atualmente testado no Ubunutu 14.04, 13.10 e 12.04, estou tentando conectar-me ao meu provedor de VPN usando o PPTP. Eu segui várias instruções, incluindo as que me foram fornecidas pelo meu provedor apenas para que elas não funcionassem.
Em uma nova instalação do ubuntu eu corro o seguinte (os bits habituais):
apt-get install network-manager-pptp pptp-linux
Depois, preencho a configuração usual no Network Manager, incluindo a habilitação do MPPE. Minha VPN tenta se conectar, mas no final falha. É assim que meu syslog se parece antes e depois de tentar se conectar. Para certificar-se de que o meu provedor de VPN e os creditos funcionam, testei no meu Mac sem problemas. O que estou fazendo de errado? Qualquer ajuda é aplacada.
May 13 18:53:28 user-VirtualBox NetworkManager[688]: <info> Starting VPN service 'pptp'...
May 13 18:53:28 user-VirtualBox NetworkManager[688]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 1530
May 13 18:53:28 user-VirtualBox NetworkManager[688]: <info> VPN service 'pptp' appeared; activating connections
May 13 18:53:28 user-VirtualBox NetworkManager[688]: <info> VPN plugin state changed: init (1)
May 13 18:53:28 user-VirtualBox NetworkManager[688]: <info> VPN plugin state changed: starting (3)
May 13 18:53:28 user-VirtualBox NetworkManager[688]: <info> VPN connection 'VPN connection 1' (Connect) reply received.
May 13 18:53:28 user-VirtualBox pppd[1532]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
May 13 18:53:28 user-VirtualBox pppd[1532]: pppd 2.4.5 started by root, uid 0
May 13 18:53:28 user-VirtualBox pppd[1532]: Using interface ppp0
May 13 18:53:28 user-VirtualBox pppd[1532]: Connect: ppp0 <--> /dev/pts/3
May 13 18:53:28 user-VirtualBox pptp[1537]: nm-pptp-service-1530 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
May 13 18:53:28 user-VirtualBox NetworkManager[688]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
May 13 18:53:28 user-VirtualBox NetworkManager[688]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
May 13 18:53:28 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'
May 13 18:53:28 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
May 13 18:53:28 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
May 13 18:53:29 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
May 13 18:53:29 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
May 13 18:53:29 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 35968).
May 13 18:53:59 user-VirtualBox pppd[1532]: LCP: timeout sending Config-Requests
May 13 18:53:59 user-VirtualBox pppd[1532]: Connection terminated.
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <warn> VPN plugin failed: 1
May 13 18:53:59 user-VirtualBox NetworkManager[688]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
May 13 18:53:59 user-VirtualBox pppd[1532]: Modem hangup
May 13 18:53:59 user-VirtualBox pptp[1537]: nm-pptp-service-1530 warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error
May 13 18:53:59 user-VirtualBox pptp[1537]: nm-pptp-service-1530 warn[decaps_hdlc:pptp_gre.c:216]: pppd may have shutdown, see pppd log
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <warn> VPN plugin failed: 1
May 13 18:53:59 user-VirtualBox pppd[1532]: Exit.
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <warn> VPN plugin failed: 1
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <info> VPN plugin state changed: stopped (6)
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <info> VPN plugin state change reason: 0
May 13 18:53:59 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[callmgr_main:pptp_callmgr.c:234]: Closing connection (unhandled)
May 13 18:53:59 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
May 13 18:53:59 user-VirtualBox pptp[1543]: nm-pptp-service-1530 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
May 13 18:53:59 user-VirtualBox NetworkManager[688]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
May 13 18:54:04 user-VirtualBox NetworkManager[688]: <info> VPN service 'pptp' disappeared