Here are some simple commands you can use to test a SSL/TLS enabled site or service.

=== Simple Connect ===

<code>
openssl s_client -connect dr.dk:443
</code>

=== Test with CA Validation ===

<code>
openssl s_client -connect localhost:9000 -CApath /etc/grid-security/certificates
</code>

=== Test a SMTP server ===

<code>
openssl s_client -connect mail.example.com:25 -starttls smtp
</code>

=== Test with Displayed Certificates ====

<code>
openssl s_client -showcerts -connect  www.thawte.com:443
</code>