1. SSL Labs:
   • Use the free service from SSL Labs to perform a comprehensive analysis of your SSL certificate, including the SSL/TLS negotiation.
   • Simply enter your website URL, and it will generate a detailed report about supported SSL/TLS versions, cipher configurations, and more.
2. OpenSSL:
   • From the command line, you can use openssl to test SSL/TLS negotiations.
   • Example:
     openssl s_client -connect yourwebsite.com:443


     This will give you details about the SSL handshake process, including TLS version and certificates.

3. Nmap:
   • Nmap, with the ssl-enum-ciphers script, can help you verify SSL negotiations.
   • Example:
     nmap --script ssl-enum-ciphers -p 443 yourwebsite.com

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