title: Blank home page and 404s after switching to HTTPS in ISPConfig 3
body: <p>First encounter with ISPConfig so I am stuck with a very basic problem:
  Hosting company activated SSL certificate for a domain and enabled part of the redirect from HTTP to HTTPS: the home page of the website is blank, going to any of the internal pages gives a 404 error (all pages are OK).
  In ISPConfig control panel I checked the SSL box, but it stays unchecked; I added to .htaccess the directive I use to redirect to HTTPS:</p>
  <pre><code>RewriteEngine On
  RewriteCond %{HTTPS} off
  RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
  </code></pre>
  <p>It does not work.
  No Options tab is visible in control panel &gt; Sites where I could add those directives.
  Hosting company tech support is lazy/overwhelmed, it takes several days to get a vague answer from them.</p>
  <p>Any help will be much appreciated!</p>