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+====== Certificates ======
+===== Client Testing =====
+[[https://badssl.com/|badssl.com]] offers a lot of links to subdomains with different tls configurations. This is helful to test how clients behave in certain situations.
+Here some examples.
+<code>
+user@laptop:~$ curl https://self-signed.badssl.com/
+curl: (60) SSL certificate problem: self-signed certificate
+More details here: https://curl.se/docs/sslcerts.html
+curl failed to verify the legitimacy of the server and therefore could not
+establish a secure connection to it. To learn more about this situation and
+how to fix it, please visit the web page mentioned above.
+</code>
+<code>
+user@laptop:~$ curl https://expired.badssl.com/
+curl: (60) SSL certificate problem: certificate has expired
+More details here: https://curl.se/docs/sslcerts.html
+curl failed to verify the legitimacy of the server and therefore could not
+establish a secure connection to it. To learn more about this situation and
+how to fix it, please visit the web page mentioned above.
+</code>
+<code>
+user@laptop:~$ curl https://dh480.badssl.com/
+curl: (35) error:0280007E:Diffie-Hellman routines::modulus too small
+</code>