title: Error - This Internet Explorer instance does not have the following capabilities: privateNetworkClientServer
body: <p>I have a Canvas application in salesforce.com
  The basic thing that a canvas application does is that it opens an external webpage in an IFRAME. The issue I have started facing for the past two days affects <strong>Internet Explorer and Microsoft Edge</strong>.</p>
  
  <p>This is working without any issues in Google Chrome and Mozilla Firefox, but a large number of my users are using IE. The page being served is over the https protocol. It does not have any mixed content. <strong>How can I make it work in IE &amp; Edge?</strong></p>
  
  <p>When I click on the link, it throws the following error message:</p>
  
  <pre><code>HTML1300: Navigation occurred.
  CSP14309: Unknown directive 'referrer' in Content-Security-Policy - directive will be ignored.
  CSP14303: Content-Security-Policy policy was empty.
  HTML1524: Invalid HTML5 DOCTYPE. Consider using the interoperable form "&lt;!DOCTYPE html&gt;".
  CSP14309: Unknown directive 'referrer' in Content-Security-Policy - directive will be ignored.
  CSP14309: Unknown directive 'upgrade-insecure-requests' in Content-Security-Policy - directive will be ignored.
  CSP14303: Content-Security-Policy policy was empty.
  HTTP404: NOT FOUND - The server has not found anything matching the requested URI (Uniform Resource Identifier).
  GET - https://login.salesforce.com/17181/logo180.png
  HTTP404: NOT FOUND - The server has not found anything matching the requested URI (Uniform Resource Identifier).
  GET - https://login.salesforce.com/17181/logo180.png
  CSP14309: Unknown directive 'referrer' in Content-Security-Policy - directive will be ignored.
  CSP14303: Content-Security-Policy policy was empty.
  SEC7117: Network request to https://MYWEBPAGE-REDACTED/CanvasLanding.aspx did not succeed.
  This Internet Explorer instance does not have the following capabilities: privateNetworkClientServer 
  SEC7111: HTTPS security is compromised by ms-appx-web://microsoft.microsoftedge/assets/errorpages/dnserror.html
  SEC7111: HTTPS security is compromised by ms-appx-web://microsoft.microsoftedge/assets/errorpages/ErrorPageStyles.css
  SEC7111: HTTPS security is compromised by ms-appx-web://microsoft.microsoftedge/Assets/ErrorPages/ErrorPageScripts.js
  SEC7111: HTTPS security is compromised by ms-appx-web:///assets/Fonts/BrowserMDL.ttf#Browser MDL2 Assets
  dnserror.html
  CSP14309: Unknown directive 'referrer' in Content-Security-Policy - directive will be ignored.
  CSP14303: Content-Security-Policy policy was empty.
  </code></pre>