Hello,
Your certificate (or certificates) for the names listed below will expire in 20 days (on 05 Jun 19 10:30 +0000). Please make sure to renew your certificate before then, or visitors to your website will encounter errors.
We recommend renewing certificates automatically when they have a third of their
total lifetime left. For Let's Encrypt's current 90-day certificates, that means
renewing 30 days before expiration. See
https://letsencrypt.org/docs/integration-guide/ for details.
odoo.ffnw.de
For any questions or support, please visit https://community.letsencrypt.org/. Unfortunately, we can't provide support by email.
If you are receiving this email in error, unsubscribe at http://mandrillapp.com/track/unsub.php?u=30850198&id=b0d83166fa234e64837aa9860bc33017.5TBEhaGhdzuJdBOHedb9lcRIUJc%3D&r=https%3A%2F%2Fmandrillapp.com%2Funsub%3Fmd_email%3Dadmin%2540lists.ffnw.de
You may need to update your client to the latest version in case it is still using the deprecated TLS-SNI-01 validation method. https://community.letsencrypt.org/t/february-13-2019-end-of-life-for-all-tls-sni-01-validation-support/74209
Step-by-step instructions for updating Certbot are here: https://community.letsencrypt.org/t/how-to-stop-using-tls-sni-01-with-certbot/83210
Regards,
The Let's Encrypt Team