OpenSSL notes

This note was created on 11/17/2023
This note was last edited on 11/17/2023

=== Check if TLS version is supported by server's certificate ===
$ openssl s_client -connect www.example.com:443 -tls1_3
$ openssl s_client -connect www.example.com:443 -tls1_2
$ openssl s_client -connect www.example.com:443 -tls1_1
$ openssl s_client -connect www.example.com:443 -tls1

=== List all supported TLS versions using NMAP ===
$ nmap --script ssl-enum-ciphers -p 443 www.example.com