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 …
For intranet servers you're probably better off with DNS-01. That's what I use in that case. Just have an externally-visible dummy dynamic zone for your intranet and have it create records in that.
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.