- https://en.wikipedia.org/wiki/HTTPS
- https://stackoverflow.com/questions/40557031/command-prompt-to-check-tls-version-required-by-a-host/55764641#55764641
- https://maxchadwick.xyz/blog/checking-ssl-tls-version-support-of-remote-host-from-command-line
I found this command line (suggested above) really, really useful:
$ nmap –script ssl-enum-ciphers -p 443 www.google.com
Make sure nmap is fairly up-to-date, otherwise you will miss too many interesting bits – seriously! In other words: it makes no sense at all working like this with an outdated nmap.