UDP: Typically, OpenVPN uses UDP as its transport protocol. The well known UDP port for OpenVPN traffic is 1194. TCP: Additionally, OpenVPN can be configured to use TCP as its transport protocol. The well known TCP port for OpenVPN traffic is 1194. Example traffic. Wireshark

How to block open vpn connection - Firewalls - Spiceworks Jan 20, 2016 Pi Hole Pivpn On Google Compute Engine Free Tier With Full Set up a Pi-Hole Ad Blocking VPN Server with a static Anycast IP on Google Cloud's Always Free Usage Tier Configure Full Tunnel or Split Tunnel OpenVPN connections from your Android, iOS, Linux, macOS, & Windows devices 1194 : tcp,udp: openvpn: OpenVPN (Virtual Private Networking) - it is newer, secure form of VPN that uses open-source technologies and is preferable to PPTP and L2TP. OpenVPN uses the OpenSSL encryption library and SSL v3/TLS v1 protocols. It listens on port 1194/UDP by default. Guaranteed communication over TCP port 1194 is the main difference between TCP and UDP. UDP port 1194 would not have guaranteed communication as TCP. UDP on port 1194 provides an unreliable service and datagrams may arrive duplicated, out of order, or missing without notice.

By default, OpenVPN uses port 1194 (UDP, although this can be easily changed to TCP). Other VPN protocols use different ports. A simple but effective way to block VPNs, therefore, is to use a firewall to block these ports. Deep packet inspection (DPI)

OpenVpn doesn't connect from remote location - OpenVPN Jan 11, 2017 FortiAuthenticator open ports Incoming ports; Purpose Protocol/Port; FortiAuthenticator: Load-balancing HA slave: UDP/721, UDP/1194. Redundant HA cluster: UDP/720: FortiClient: SSO Mobility Agent

The command shows that it is listening in the UDP section: udp: 1194 * (openvpn) [ 4] allow 1194/udp – Chris Dec 17 '16 at 11:24 Good thought, but my host is a VPS and not behind a router or firewall so I think the filtering is happening in the server itself – Chris Dec 17 '16 at 11:25

how to add multiple ports (say 1194,943 and 443 in UDP and Dec 30, 2016 OpenVPN download | SourceForge.net Download OpenVPN for free. Robust and flexible VPN network tunnelling. OpenVPN is a robust and highly flexible tunneling application that uses all of the encryption, authentication, and certification features of the OpenSSL library to securely tunnel IP networks over a single TCP/UDP port.