This could be an incorrect use of certificates. Make sure to use the following (translate to nginx if you're not using apache) 1SSLCertificateFile /etc/letsencrypt/live/example.com/cert.pem 2SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem 3Include /etc/letsencrypt/options-ssl-apache.conf …