Server check: Enter your domain name.
CDN check: Enter your CNAME (e.g. images.domain.tld) or CDN domain.
Your SSL/TLS certificates are used to establish HTTPS connections that can run on all SSL and TLS protocol versions. However, all SSL protocols have already been deprecated by IETF and you’ll see them marked red if enabled.
TLS 1.3 encryption protocol enhances the HTTPS performance and security for all users and provides many improvements in comparison with TLS 1.2 and older. The most prominent one is reduced latency by making the TLS handshake shorter and more efficient before any secure session is established.
Draft 28 is the final version approved by IETF and should be used if TLS 1.3 is enabled.