client remote openvpn2027.ch.cam.ac.uk 443 auth-user-pass cipher AES-256-GCM data-ciphers AES-256-GCM:AES-128-GCM:AES-256-CBC dev tun proto udp nobind auth-nocache script-security 2 persist-key persist-tun reneg-sec 0 setenv opt verify-x509-name openvpn2027.ch.cam.ac.uk name