Opening ports for OpenVPN w/Comcast ISP
Techopedia explains VPN Port. The number and type of VPN ports utilized depends on the protocol used. For example, the PPTP protocol uses TCP port number 1723 to create a connection to IP port 47 Generic Routing Encapsulation (GRE) for packet encapsulation. Similarly, IPSec-based VPN that provides a higher level of security utilizes several ports for security, such as IP port numbers 50 and 51 for Encapsulated Security Protocol (ESP) and Authentication Header (AH), respectively. Apr 04, 2018 · OpenVPN uses open-source technologies like the OpenSSL encryption library and SSL v3/TLS v1 protocols. It can be configured to run on any port, so you could configure a server to work over TCP port 443. The OpenSSL VPN traffic would then be practically indistinguishable from standard HTTPS traffic that occurs when you connect to a secure website. The official OpenVPN port number is 1194, but any port number between 1 and 65535 will work. If you don't provide the 'port' option, 1194 will be used. An example using port 443 port 443 Make sure that openvpn server listens to port 1194 in the configuration file /etc/openvpn/server.conf, and that nginx listens to the standard 443 port in the configuration file in the /etc/nginx/sites-enabled/ folder.
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Transparent SSLH: using a single port to transparently SSLH will analyse traffic incoming to port 443, and if it's standard https then it transparently forwards this traffic to port 4443, and if it's OpenVPN traffic then it forwards it to our standard server-side OpenVPN port 1194. SSLH also supports SSH traffic as well, so you could also route SSH traffic through port 443. What is OpenVPN? | NordVPN Customer Support
SSLH will analyse traffic incoming to port 443, and if it's standard https then it transparently forwards this traffic to port 4443, and if it's OpenVPN traffic then it forwards it to our standard server-side OpenVPN port 1194. SSLH also supports SSH traffic as well, so you could also route SSH traffic through port 443.
VPN Ports to Open - social.technet.microsoft.com Nov 27, 2011