I'm assuming you are referring to an IN-bound port 80.
There's nothing to stop anyone from running, for example, a TELNET server on port 80.
As a minimum, you should only open an inbound port to the specific server(s)
supporting that protocol, whether it be HTTP, HTTPS, SMTP, POP3, etc...
>If I've opened up port 80 on a firewall, does this mean that ONLY HTTP
>traffic can pass through, or can anything that's configured to use port 80,
>can pass through?
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