OpenSSL on Linux servers includes a command line tool for testing TLS.

Comprehensive and Detailed Explanation:

The OpenSSL command-line utility s_client is used to test SSL/TLS connections.

Correct syntax:

openssl s_client -connect www.website.com:443

This command will initiate a TLS connection to port 443 on the given domain and allow you to inspect certificates, cipher suites, and server responses.

From CEH v13 Courseware:

Module 12: Cryptography → SSL/TLS Testing Tools