In comp.sys.raspberry-pi, Martin Gregorie   wrote:
> On Thu, 21 Nov 2019 21:56:43 +0000, Eli the Bearded wrote:
>> I use 8000 (http) or 8443 (https) myself. Andy's point I think is that
>> vnc is usually on port 5900 (or 5900 + N for the (N-1)th instance), so
>> are you (OP) really sure it is supposed to be vnc traffic?
> In case you haven't heard about it, most Linux distros, including
> Raspbian, have a copy of the file /etc/service

/etc/services is not a Linux thing, it's a Unix thing. I recall editing
it for adding "well known" service names for the in-house software back
when I was working with Solaris desktop computers.

> This is a plaintext ASCII file that lists all the well-defined network
> services and the ports they are expected to use.

That said, 8080 is convention, not law. My current /etc/services is
system stock and does not have 8443, but you can find lots of people
using it if you search. And my ISP offers Privoxy as a service. It's a
privacy oriented HTTP proxy. They run it on ports 8008 and 8118, in
two configurations (8118 blocks more stuff).

Make TCP you friend and you will understand when to use the well-known
ports, when to use your own ports, and a good feel for why to use one
or the other.

Elijah
------
finds only three "http" ports in /etc/services but many more in reality

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