For LetsEncrypt, the acme-v01 API is the only production endpoint as of this time [1], which only supports the -01 version of tls-sni. [1] https://letsencrypt.

For LetsEncrypt, the acme-v01 API is the only production endpoint as of this time [1], which only supports the -01 version of tls-sni. [1] https://letsencrypt.status.io/ https://letsencrypt.status.io/