Connect to CUPS web interface of Ubuntu instance on Google Compute Engine
<p>I have installed <em>CUPS</em> on a <em>Ubuntu Xenial VM</em> instance of Google compute engine. I have changed settings as described <a href="http://thismightbehelpful.blogspot.be/2008/09/remote-access-to-cups-web-interface.html" rel="nofollow">here</a> and <a href="http://www.thegeekstuff.com/2016/02/cups-admin-ui-access/" rel="nofollow">here</a> and restarted the CUPS server.</p>

<p>I'm trying to access the web interface through <code>http(s)://my-external-ip:631/admin</code> but that is not reachable. Pinging to the External IP works.</p>

<p>How can I troubleshoot or what extra configuration might be needed in the CUPS configuration or VM instance configuration?</p>