&gt; ...try accessing a (non-localhost) website hosted on a port 6666 in Chrome. You can&#x27;t, Chrome has a blacklist of &quot;insecure&quot; ports.<p>The reasoning for that is -apparently- as follows: &quot;So, why does Chrome refuse to connect to some ports? Because the Google engineers has gone through the list of well known ports, and worked out how tolerant the protocols that use these ports are to being sent HTTP requests, and if they are tolerant, they&#x27;ve marked it as unsafe and so blocked it, to prevent Google Chrome from being an open proxy to a secured network.&quot; [0]<p>I&#x27;m not sure how I feel about that reasoning.<p>[0] <a href="https:&#x2F;&#x2F;jazzy.id.au&#x2F;2012&#x2F;08&#x2F;23&#x2F;why_does_chrome_consider_some_ports_unsafe.html" rel="nofollow">https:&#x2F;&#x2F;jazzy.id.au&#x2F;2012&#x2F;08&#x2F;23&#x2F;why_does_chrome_consider_some...</a>