OpenVPN, Tunnelblick, OpenVPN Connect, .ovpn, CRL, systemctl status openvpn, /var/log/openvpn.log, /lib/systemd/system/openvpn.service, systemctl status openvpn-server@server, etc/openvpn, /etc/openvpn/server.conf, /etc/pam.d/openvpn, /etc/openvpn/users
