> You can have any port be the default http port. It doesn't have to be 80.
>
> If you change /etc/services and just tell tomcat or apache to listen on
> something else, it still works fine, and people don't have to remember
> the port.
>
> Right?
> Daniel

All true since no port number has to mean anything.  But I've yet to see any
actively used production web site that didn't use 80/443 because those are
the ONLY ONES that can be reached without specifying a port number in the
URL.   Considering the fact that absolutely nobody in the non-development
world ever types in a URL with a port number, you can rest assured that no
production web site relies on non-standardized port numbers.

Then when  you consider firewalls, the ability for many sites to reach
non-standard ports gets worse because many well-secured networks block
outgoing connections to arbitrary IP+ports.  Allowing outgoing connections
to be made to port 80 is common, but others are typically blocked (even
spyware and virus-introduced backdoors often use port 80 just for that
reason, even though the other end is not necessarily a web site).

So you can use any port number you want, even ones assigned to other systems
like DNS or SMTP, but the expected behavior won't occur.

David


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