Attempting to renew cert produced an unexpected error: The nginx plugin is not working; there may be problems with your existing configuration. The error was: NoInstallationError(). Skipping

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Hi @jpgklassen

tls-sni-01 - validation is deprecated. Support ends 2019-02-13.

So use

sudo /usr/bin/certbot renew --nginx -preferred-challenges http

instead.

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