OpenVPN is a relatively new and highly configurable protocol. ExpressVPN’s version supports both UDP and TCP ports. UDP stands for User Datagram Protocol. Though it can be configured to run on any port, OpenVPN runs best on a UDP port, which is generally faster. ExpressVPN uses UDP by default

Solved: How to configure CISCO RV320 OPENVPN in - Cisco - configure openvpn cisco server (password only) - configure openvpn cisco username & password - download the .ovpn file - edit the .ovpn file and add ,at the end of the file, the root certificate between tag. have a look on the faq available on open vpn => for this have a look at : that's also applicable for other os. What is OpenVPN & How to Use It? - PureVPN Jul 09, 2020

A VPN port is a networking port that is commonly used in the VPN infrastructure. They are logical ports named using sequenced numbers and making it possible for VPN traffic to pass inside and outside of the server device or VPN client.

OpenVPN Server can work behind the Router at private IP address if only 1194_UDP port forward from router to your OpenVPN Server. Example: Public IP of ROUTER (WAN Interface) LAN Interface of ROUTER OpenVPN Server IP Create a port forward rule at ROUTER Internal_port External_port Internal_Server_ip 1194 1194 OpenVPN - DD-WRT Wiki Port port which OpenVPN server is listening on. {1194} [port xxx] Tunnel Device (TUN/TAP) The mode of tunneling. TUN: routing (layer 3), TAP: bridgeing (layer 2. can be used for routing, too, but its not very common). [dev-type tun/tap] Tunnel Protocoll (UDP/TCP) The subprotocol the connection will use on the connection. {udp} [proto udp/tcp] How to Set Up the Windows 10 Built-In VPN Service

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Where x.x.x.x is the internal IP address of the web server to which the non-VPN traffic will be forwarded.. Now if OpenVPN client hits that port, it will connect and work fine, and if a web browser is pointed at the same IP and port using HTTPS, it will be connected to the web server.