Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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They don't even need to be the same process. I'm pretty sure that's just a common practice if something needs both protocols, but there's nothing stopping you from having a web server on TCP 443 and a VPN server on UDP 443. Ports are an abstraction brought by each protocol, they aren't in anyway related.
Some protocols, like ICMP, don't have the concept of ports at all!