Fix Nginx "SSL_do_handshake() failed" Error
Fix the Nginx SSL_do_handshake() failed error on a proxy server by enabling proxy_ssl_server_name, which passes the server name through the TLS SNI extension.
How to Enforce TLS 1.2 and 1.3 in Magento 2
Make sure that your Magento 2 store is not vulnerable to POODLE attack. You should update your website as soon as possible if you still use TLSv1.1.