You might encounter below error:
Failed authorization procedure. example.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://example.com/.well-known/acme-challenge/jTcgYGTDkvxnX0ocm9NKrJyyM0rAgwwflurdfUURH_Q: "
- The following errors were reported by the server:
Detail: Invalid response from
This happens when you requested LetsEncrypt for new certificate, and LetsEncrypt system tries to contact your website in your web root under directory: .well-known
This is due to our web server are configured to deny accessing this directory.
Search below lines in your httpd.conf or .htaccess file.
# Order allow,deny