title: 407 Proxy Authentication Required
body: <p>I'm getting the following exception while making a call using XMLHttp object asynchronously in Mozilla Firefox.</p>
  
  <pre><code>407 Proxy Authentication Required
  The ISA Server requires authorization to fulfill the request.
  Access to the Web Proxy filter is denied.
  </code></pre>
  
  <h3>Description of cause:</h3>
  
  <p>Actually I'm trying to make an asynchronous request to using get in javascript. It is working fine using IE 6 but for IE 7 and Firefox 3.5, it will it won't get any data using asynchronous request so how to overcome this problem?</p>
  
  <p>When I debug in Firefox 3.5 using firebug it shows </p>
  
  <pre><code>407 Proxy Authentication Required The ISA Server requires authorization to fulfil the request. Access to the Web Proxy filter is denied.
  </code></pre>
  
  <p>exception at console so how to tackle this issue</p>
  
  <p>Note: our network has proxy server</p>