title: Cookies disabled message with Vaadin running under Tomcat 8 and Apache with proxying
body: <p>I have a web application based on Vaadin and deployed it to my Tomcat 8 web app server. To access the application without port number etc. I installed an Apache web server and configured the VirtualHost to proxy it through. The problem now is, that I always get the following message, if I try to click on a Button etc. in the web application:</p>
  
  <pre><code>Cookies disabled
  This application requires cookies to function.
  Please enable cookies in your browser and click here or press ESC to try again.
  </code></pre>
  
  <p>All cookies are enabled and I'm using Chrome browser. Also the cookies from this webpage are retrieved and are valid.</p>
  
  <p>If I access the web application the normal way with the port specification, I can click all content without errors.</p>