I too received the following mail: Hello, Action is required to prevent your Let's Encrypt certificate renewals from breaking. Your Let’s Encrypt client used ACME TLS-SNI-01 domain validation to issue a certificate in the past 60 days. TLS-SNI-01 validation is reaching end-of-life and will stop …

To be 100% sure: Double check the logs to see it says “http-01” in the challenges - which is should.

Action required: Let's Encrypt certificate renewals

lroslundh January 22, 2019, 1:13pm 7

Yes of course ./certbot-auto renew --dry-run

Wrote it from memory - my bad!

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