This is technically true, but contextually lacking.
acme-go/lego doesn't use HTTP validation unless you disable just about every other form of validation first. TLS-ALPN validation is much more likely, so port 443.
That said, it is very easy to allow software to bind to privileged ports without providing it root access; this has been solved for a very, very long time.
acme-go/lego doesn't use HTTP validation unless you disable just about every other form of validation first. TLS-ALPN validation is much more likely, so port 443.
That said, it is very easy to allow software to bind to privileged ports without providing it root access; this has been solved for a very, very long time.