The recent @letsencrypt shutdown of TLS-SNI-01 validation (due to idiotic hosting providers) is very disappointing. It was by far the most convenient, hands-off, universal validation mechanism. https://community.letsencrypt.org/t/2018-01-11-update-regarding-acme-tls-sni-and-shared-hosting-infrastructure/50188 …
Ooooh. I didn't think of this. Thanks! I might start using this method for some zones.
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Another trick is to add a NS record as each _acme-challenge... delegating the looking of each label to its very own zone, inside that zone , which is dynamic, the TXT is just added on the blank base label.
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Just used the CNAME trick at work yesterday. Good timing.
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