Beyond a Simple Check: Understanding SSL Certificate Expiry and Full HTTPS Diagnostics
https://nova-wiki.win/index.php/Beyond_a_Simple_Check:_Understanding_SSL_Certificate_Expiry_and_Full_HTTPS_Diagnostics
We usually think about SSL expiry only when a warning pops up, but there's much more going on in a TLS handshake. This guide dives into the full diagnostics, from certificate chain validation to cipher suite negotiation, so you can pinpoint why a connection might fail even when the certificate hasn't expired yet.