Their certificate is signed by a trusted CA, but they forgot to ship the intermediate certificate.<p>I always test my domains with Quals SSL server test:<p><a href="https:&#x2F;&#x2F;www.ssllabs.com&#x2F;ssltest&#x2F;analyze.html?d=staticman.net" rel="nofollow">https:&#x2F;&#x2F;www.ssllabs.com&#x2F;ssltest&#x2F;analyze.html?d=staticman.net</a><p>There are a couple of other issues with their SSL setup. I also recommend Mozilla&#x27;s SSL config generator:<p><a href="https:&#x2F;&#x2F;mozilla.github.io&#x2F;server-side-tls&#x2F;ssl-config-generator&#x2F;" rel="nofollow">https:&#x2F;&#x2F;mozilla.github.io&#x2F;server-side-tls&#x2F;ssl-config-generat...</a>