My domain is: circuitdigest.com
I ran this command: /opt/letsencrypt/letsencrypt-auto renew --dry-run
It produced this output: No output, just going blank
The operating system my web server runs on is (include version): Using CentOS 6/Apache-2.2.15 /Linode_VPS/single domain running on VPS and manually edited the vhost file.
It was all working perfectly but last attempt was failed, logging below lines in /var/log/letsencrypt/letsencrypt-auto-update.log file:
Timeout during connect (likely firewall problem)