Ubuntu Server 16.04
Using Dynu.com for Dynamic DNS
sudo certbot --apache
http-01 challenge for cns-itpro.dynu.com
http-01 challenge for www.cns-itpro.dynu.com
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. cns-itpro.dynu.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://cns-itpro.dynu.com/.well-known/acme-challenge/~challenge key~: "
The following errors were reported by the server:
Detail: Invalid response from
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address.