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无法从 Ubuntu 18.04 Linux 连接到 PPTP VPN 服务器

tag-icon • tag-icon 18.04 network-manager vpn pptp pptpd
无法从 Ubuntu 18.04 Linux 连接到 PPTP VPN 服务器

我尝试将 PPTP 作为 VPN 客户端。我尝试使用多种方法来指定 IP 地址、用户名和密码。我尝试使用 GUI 和终端两种方式，但都没有成功。

在我尝试调试后，发现了一些错误。我尝试解决这些问题，但没有成功。

tail -f /var/log/syslog | grep NetworkManager

Oct  6 16:09:05 neos NetworkManager[1101]: <info>  [1601980745.9327] audit: op="connection-activate" uuid="c7412e35-28d4-4825-b7a5-9c7e8a6a1070" name="VPN 1" pid=5831 uid=1000 result="success"
Oct  6 16:09:05 neos NetworkManager[1101]: <info>  [1601980745.9406] vpn-connection[0x5636de916480,c7412e35-28d4-4825-b7a5-9c7e8a6a1070,"VPN 1",0]: Started the VPN service, PID 28721
Oct  6 16:09:05 neos NetworkManager[1101]: <info>  [1601980745.9500] vpn-connection[0x5636de916480,c7412e35-28d4-4825-b7a5-9c7e8a6a1070,"VPN 1",0]: Saw the service appear; activating connection
Oct  6 16:09:05 neos NetworkManager[1101]: <info>  [1601980745.9600] vpn-connection[0x5636de916480,c7412e35-28d4-4825-b7a5-9c7e8a6a1070,"VPN 1",0]: VPN connection: (ConnectInteractive) reply received
Oct  6 16:09:05 neos NetworkManager[1101]: <info>  [1601980745.9629] vpn-connection[0x5636de916480,c7412e35-28d4-4825-b7a5-9c7e8a6a1070,"VPN 1",0]: VPN plugin: state changed: starting (3)
Oct  6 16:09:05 neos NetworkManager[1101]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Oct  6 16:09:05 neos NetworkManager[1101]: Using interface ppp0
Oct  6 16:09:05 neos NetworkManager[1101]: Connect: ppp0 <--> /dev/pts/1
Oct  6 16:09:05 neos NetworkManager[1101]: <info>  [1601980745.9856] manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/6)
Oct  6 16:09:06 neos NetworkManager[1101]: <info>  [1601980746.0001] devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Oct  6 16:09:06 neos NetworkManager[1101]: <info>  [1601980746.0004] device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Oct  6 16:09:37 neos NetworkManager[1101]: LCP: timeout sending Config-Requests
Oct  6 16:09:37 neos NetworkManager[1101]: Connection terminated.
Oct  6 16:09:37 neos NetworkManager[1101]: <info>  [1601980777.0179] devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Oct  6 16:09:37 neos NetworkManager[1101]: Terminating on signal 15
Oct  6 16:09:37 neos NetworkManager[1101]: Child process /usr/sbin/pptp 66.181.169.163 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-28721 (pid 28728) terminated with signal 15
Oct  6 16:09:37 neos NetworkManager[1101]: Modem hangup
Oct  6 16:09:37 neos NetworkManager[1101]: <info>  [1601980777.0262] vpn-connection[0x5636de916480,c7412e35-28d4-4825-b7a5-9c7e8a6a1070,"VPN 1",0]: VPN service disappeared

如果有人知道问题出在哪里。请帮助我。

答案1

我也遇到了同样的问题。我通过清除所有防火墙规则解决了这个问题（请参阅https://serverfault.com/questions/200635/best-way-to-clear-all-iptables-rules如何使用 iptables 来实现这一点）。

看来我最近测试的防火墙留下了一些规则，开始阻止 VPN 通信。

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