title: NTLM with Postman shows "JSONError | Unexpected token '<' at 1:1 "
body: <p>I have script to do API automation by fetching data from CSV file and comparing JSON response with the data in CSV file in POSTMAN. I have 12 scenarios/ iterations  to verify and each scenario sends more than 20 data picking from CSV file and from JSON response compared more than 10 data. Everything is working fine.</p>
  
  <p>Now Security feature implemented in code, so I have to send the request and Automate the script with ID/PWD. So I used NTML authentication with ID and PWD.</p>
  
  <p>When I run the script with runner, initial two iteration gives perfect response and script passed, then from 3rd iteration all script failed and not getting response. In response it says Data unavailable when I checked in postman console it shows below details.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
  &lt;head&gt;
  &lt;meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/&gt;
  &lt;title&gt;401 - Unauthorized: Access is denied due to invalid credentials.&lt;/title&gt;
  &lt;style type="text/css"&gt;
  &lt;!--
  body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
  fieldset{padding:0 15px 10px 15px;} 
  h1{font-size:2.4em;margin:0;color:#FFF;}
  h2{font-size:1.7em;margin:0;color:#CC0000;} 
  h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;} 
  #header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
  background-color:#555555;}
  #content{margin:0 0 0 2%;position:relative;}
  .content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;}
  --&gt;
  &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div id="header"&gt;&lt;h1&gt;Server Error&lt;/h1&gt;&lt;/div&gt;
  &lt;div id="content"&gt;
   &lt;div class="content-container"&gt;&lt;fieldset&gt;
    &lt;h2&gt;401 - Unauthorized: Access is denied due to invalid credentials.&lt;/h2&gt;
    &lt;h3&gt;You do not have permission to view this directory or page using the credentials that you supplied.&lt;/h3&gt;
   &lt;/fieldset&gt;&lt;/div&gt;
  &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>What could be the reason and any solution to solve this.</p>
  
  <p><a href="https://i.stack.imgur.com/SVe5j.png" rel="nofollow noreferrer">Screen short</a></p>
  
  <p>Used NTLM Authentication [BETA] authorization option with ID/PWD</p>
  
  <p>Here are the details for pass scenario</p>
  
  <pre><code>Request Headers:
  content-type:"application/json"
  cache-control:"no-cache"
  user-agent:"PostmanRuntime/7.1.5"
  accept:"*/*"
  host:"xxxxxx"
  accept-encoding:"gzip, deflate"
  content-length:599
  authorization:"NTLM TlRMTVNTUAADAAAAGAAYAFIAAAAYABgAagAAAAAAAABIAAAACgAKAEgAAAAAAAAAUgAAAAAAAACCAAAABYKIogUBKAoAAAAPUAAzAFcATABJAPxv7ESeMEwAAAAAAAAAAAAAAAAAAAAAAHZECYztsK+qnjG5K0DvDIPzQ09CFXWo0Q=="
  
  Request Body:
  
  Response Headers:
  transfer-encoding:"chunked"
  content-type:"application/json; charset=utf-8"
  location:"xxxxxx/api/rate/zzz"
  server:"Kestrel"
  persistent-auth:"true"
  date:"Wed, 06 Jun 2018 13:40:05 GMT"
  
  Response Body:
  rate:5
  retailRateAttributes:
  error:null
  </code></pre>
  
  <p>Here are the details of Failed scenario</p>
  
  <pre><code>   Request Headers:
  content-type:"application/json"
  cache-control:"no-cache"
  authorization:"NTLM TlRMTVNTUAADAAAAGAAYAFIAAAAYABgAagAAAAAAAABIAAAACgAKAEgAAAAAAAAAUgAAAAAAAACCAAAABYKIogUBKAoAAAAPUAAzAFcATABJAPxv7ESeMEwAAAAAAAAAAAAAAAAAAAAAAHZECYztsK+qnjG5K0DvDIPzQ09CFXWo0Q=="
  user-agent:"PostmanRuntime/7.1.5"
  accept:"*/*"
  host:""xxxxxx""
  accept-encoding:"gzip, deflate"
  content-length:599
  
  Request Body:
  
  Response Headers:
  content-type:"text/html"
  server:"Microsoft-IIS/10.0"
  www-authenticate:
  0:"Negotiate"
  1:"NTLM"
  date:"Wed, 06 Jun 2018 13:40:05 GMT"
  content-length:"1293"
  
  Response Body:
  </code></pre>