Here’s another command to check what version of SSL and TLS is being used.
nmap --script ssl-enum-ciphers -p 443 server.domain.com |
Result
PORT STATE SERVICE 443/tcp open https | ssl-enum-ciphers: | TLSv1.2: | ciphers: ... |
In this example, only TLSv1.2 is in use. For security purposes, use TLSv1.2 or higher.