- Plesk for Linux
The website example.com is not accessible with the following error message in a browser:
PLESK_INFO: Error 526 Invalid SSL certificate
The website www.example.com is working fine.
The website www.example.com is using Cloudflare.
The domain example.com is resolved to the server, while www.example.com - to Cloudflare:
# dig +short example.com @220.127.116.11
# dig +short www.example.com @18.104.22.168
Unable to issue Let's Encrypt certificate:
PLESK_ERROR: Error: Could not issue a Let's Encrypt SSL/TLS certificate for example.com.
The authorization token is not available at http://example.com/.well-known/acme-challenge/_sJGmwn5GZYcXm8nqwAMKLBvOpBXLaokwCHjby3MvY4.
To resolve the issue, make sure that the token file can be downloaded via the above URL.
Contact Cloudflare Support for assistance.