Tiger tells me what's listening on ports. It's usually quite sparse.

On Sun, Nov 29, 2020 at 06:00:02PM -0500, Tiger automatic auditor at april wrote:
> # Checking listening processes
> OLD: --WARN-- [lin003w] The process `smtpd' is listening on socket 25 (TCP on every interface) is run by postfix.

Yes, Iuse posstfix to send and receive email.

But I also have a web server running on the same machine. Why is it
never listed as also listening?