Unable to renew or create cert

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2
  1. Make sure you are upgraded to the latest version of Certbot: https://certbot.eff.org/lets-encrypt/ubuntuxenial-nginx. The behavior of your Certbot indicates it may be pretty old.
  2. Try add --preferred-challenges http to the end of your certbot command, TLS-SNI was disabled a while ago, and this is also somewhat related to old Certbot versions.
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