title: Office Web Add-In won't load properly. Connection Refused
body: <p>I'm testing an Outlook web add-in both in Chrome and Edge.
  I'm using IIS-Express (Launched from VS2017)</p>
  
  <p>The icon pointed to by the  "iconURL" element in the manifest file will not load.  I get the following error:</p>
  
  <blockquote>
    <p><strong>Failed to load resource: net::ERR_CONNECTION_REFUSED</strong></p>
  </blockquote>
  
  <p>Clearing the browser cache didn't help.</p>
  
  <p>What we noticed was that when a new test project (Outlook web Add-in) was created, everything worked normally.</p>
  
  <p>We suspect that IIS-Express isn't being launched by our regular project.  </p>
  
  <p>We think that because we had to click the stop debugging button to end the debug session in the test Add-in, but in our regular add-in the "Start" button was still active as if no debugging session was started!</p>
  
  <p>Any ideas?</p>