我通过 CLI 建立了一个有效的 VPN 连接：
sudo openvpn myconfigfile.ovpn
我在网络管理器 GUI 中导入了该文件，当我尝试使用它时，它总是失败，但我找不到原因。我通过以下方式查看了 NetworkManager 的日志：
journalctl -u NetworkManager
它给出了这个：
sept. 06 09:30:56 alt-machine NetworkManager[19942]: <info> [1504683056.7617] audit: op="connection-activate" uuid="24fc3644-b324-46a4-9ce1-c1a0fcea1b75" name="name-of-connection" pid=3406 uid=1000 result="success"
sept. 06 09:30:56 alt-machine NetworkManager[19942]: <info> [1504683056.7900] vpn-connection[0x55e876784720,24fc3644-b324-46a4-9ce1-c1a0fcea1b75,"name-of-connection",0]: Started the VPN service, PID 23791
sept. 06 09:30:56 alt-machine NetworkManager[19942]: <info> [1504683056.8118] vpn-connection[0x55e876784720,24fc3644-b324-46a4-9ce1-c1a0fcea1b75,"name-of-connection",0]: Saw the service appear; activating connection
sept. 06 09:30:56 alt-machine nm-openvpn[23798]: OpenVPN 2.4.0 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Jun 22 2017 …