Your certificate (or certificates) for the names listed below will expire in 9 days (on 08 Jul 19 19:19 +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.
For any questions or support, please visit https://community.letsencrypt.org/. Unfortunately, we can't provide support by email.
For details about when we send these emails, please visit https://letsencrypt.org/docs/expiration-emails/. In particular, note that this reminder email is still sent if you've obtained a slightly different certificate by adding or removing names. If you've replaced this certificate with a newer one that covers more or fewer names than the list above, you may be able to ignore this message.
If you are receiving this email in error, unsubscribe at http://mandrillapp.com/track/unsub.php?u=30850198&id=2eef1766e9ca43959897ffc561fc2a32.ASoG9xqfEug89um4JoJs0hEKMgQ%3D&r=https%3A%2F%2Fmandrillapp.com%2Funsub%3Fmd_email%3Dadmin%2540ffnw.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
The Let's Encrypt Team