Cron <root at horae> /usr/local/bin/certbot renew

[Cron Daemon]

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Processing /etc/letsencrypt/renewal/tcube.autonlab.org.conf
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Renewing an existing certificate for tcube.autonlab.org

Certbot failed to authenticate some domains (authenticator: webroot). The Certificate Authority reported these problems:
  Domain: tcube.autonlab.org
  Type:   connection
  Detail: Fetching http://tcube.autonlab.org/.well-known/acme-challenge/k4b5pjx_uzcyG5JIHFT3iwt7Oj51MLGHyoQyjufhXqs: Connection refused

Hint: The Certificate Authority failed to download the temporary challenge files created by Certbot. Ensure that the listed domains serve their content from the provided --webroot-path/-w and that files created there can be downloaded from the internet.

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Failed to renew certificate tcube.autonlab.org with error: Some challenges have failed.

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All renewals failed. The following certificates could not be renewed:
  /etc/letsencrypt/live/tcube.autonlab.org/fullchain.pem (failure)
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1 renew failure(s), 0 parse failure(s)
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.