Apache can't start "could not bind to address [::]:443" though no process is using it, and netcat can openit

Found it

Listen 443 was present two times among the different configuration files of apache

it's a pity apache does not have a more explicit error/warning message (i.e "option defined two times" etc.)

It seems another process is using port 443 on your server.

netstat -anp | grep 443

output will be

tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN

disable port 443 and start

systemctl start httpd.service

CodeHunter