Activating privacy features…2018/01/13 15:38:27 [www.unityhome.online] failed
to get certificate: acme: Error 403 - urn:acme:error:unauthorized - Invalid resp
onse from http://www.unityhome.online/.well-known/acme-challenge/wTbf0CfEwzlyx5B
_iII5oX200F_nXEz-KYRINj7H-20 [MYIPHERE]: 404
Error Detail:
Validation for www.unityhome.online:80
Resolved to:
IP
Used: IP
To be unambiguous, the ACME server returned a 403 (forbidden) response to your request for a certificate, because when it contacted http://www.unityhome.online and asked for the file located at /.well-known/acme-challenge/wTbf0CfEwzlyx5B_iII5oX200F_nXEz-KYRINj7H-20, the server it connected to responded with status 404 (file not found).
This is probably because Caddy isn’t actually listening to port 80 at the IP address the DNS is pointed at. Sometimes people actually have an Apache server up and don’t realise, or maybe their router’s web GUI is in the way.