Let's Encrypt

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wikipedia:Let's Encrypt

Let's Encrypt do not support certificates for IP address. https://github.com/certbot/certbot/issues/1985#issuecomment-166733399

See also

• HTTP, HTTP client, HTTP/1.1, HTTP/2, HTTP/3, HTTPS, HSTS CSR, TLS, SSL, openSSL, WebSockets, WebRTC, ssl_certificate QUIC, HPKP, CT, List of HTTP status codes, URL redirection, Content-type:, Webhook, HTTP headers, --insecure, Axios HTTP client, HTTP cookies, HTTP ETag, Hypertext Transfer Protocol -- HTTP/1.1