Acme:error 400: Caddy2.0 WP-Freenas

[matt (Matt Holt)]

@kenden

[blog.endnot.casa] acme: error: 403 :: urn:ietf:params:acme:error:unauthorized :: Cannot negotiate ALPN protocol "acme-tls/1" for tls-alpn-01 challenge, url: 
 (challenge=tls-alpn-01 remaining=[http-01])

This error means that Let’s Encrypt isn’t connecting to Caddy, but to some other TLS endpoint (or maybe not a TLS endpoint at all). Make sure your DNS and network infrastructure are set up correctly.