Bonus points to certbot: when it errors out saying "(probably caused by a firewall)" -- it was, indeed, a firewall issue. Who uses port 80 these days?
TLS cert verification via HTTP-01, that's who.
Moves my priority for DNS-01 up a bit, but that involves switching the whole authoritative DNS infra for the home org.
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@dashdsrdash Homelab stuff is a different ballgame but YIKES HTTP/1 cert validation is no bueno :)
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text/gemini