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Last I checked, which was honestly two or more years prior, CloudFlare doesn’t handle second level sub domains (I.E. a.b.domain.ext) properly… when I tried it, I could make the DNS records, it did resolve, but the certificates didn’t work. I don’t know if that has since changed.
You likely wouldn’t be using cloudflare for that level anyways, since you want it to work when you’re offline you’d bypass them entirely with local DNS server, local reverse proxy+certs. You’d use something like certbot with let’s encrypt which works fine. https://certbot.eff.org/
Last I checked, which was honestly two or more years prior, CloudFlare doesn’t handle second level sub domains (I.E.
a.b.domain.ext
) properly… when I tried it, I could make the DNS records, it did resolve, but the certificates didn’t work. I don’t know if that has since changed.You likely wouldn’t be using cloudflare for that level anyways, since you want it to work when you’re offline you’d bypass them entirely with local DNS server, local reverse proxy+certs. You’d use something like certbot with let’s encrypt which works fine. https://certbot.eff.org/