我购买了一个 VPN 帐户，并尝试按照 vpn 提供商 (RA4W) 提供的说明连接到它。我正在使用 ubuntu 16.4 基本上我被指示安装 openVPN 然后通过输入配置和连接：
sudo openvpn --config path/to/location.ovpn
结果是：
$ sudo openvpn --config ~/Desktop/ra4wvpn-nl-amsterdam-udp-1194.ovpn
Fri Sep 1 13:45:15 2017 OpenVPN 2.3.10 x86_64-pc-linux-gnu [SSL
(OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Jun 22 2017
Fri Sep 1 13:45:15 2017 library versions: OpenSSL 1.0.2g 1 Mar 2016,
LZO 2.08
Enter Auth Username: ******
Enter Auth Password: **********
Fri Sep 1 13:45:26 2017 WARNING: No server certificate verification
method has been enabled. See http://openvpn.net/howto.html#mitm …