Ssl won't renew

That is probably a very old version of Certbot.

The problem can be resolved by upgrading with the installation instructions on https://certbot.eff.org/lets-encrypt/ubuntuxenial-apache .

Without upgrading, you can potentially solve your issue with:

--preferred-challenges http

Please read IMPORTANT: What you need to know about TLS-SNI validation issues for information regarding that error message.

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