I have found a CLI command that changes HestiaCP login port in second!

Site is down, here is a permalink: Tutorial: How to Customize HestiaCP (a fork of VestaCP) on Debian 9 Server | AngelRight.com

Why can’t I change it to port 443?
We have hundreds of users, it’s not like the config panel location is a secret.

$ sudo /usr/local/hestia/bin/v-change-sys-port 443
Port is already used by Hestia, please set anotherone!

Also see How to change the port of "HestiaCP"? - #4 by tecprueba12