title: How handle Application Error Exception code: 0xc00000fd
body: <p>I have an ASP.Net Web API application deployed via IIS. It is in <strong>Windows Authentication enable</strong> mode only because I want to detect Windows users who access the APIs. </p>
  
  <p>For a few days the application will work fine but occasionally it will fail. 
   When the application fails it will present the login prompt several times (minimum 3 times) when requesting the API.  Instead of responding to credentials a "Service Unavailable" message is presented.  At this point the site's application pool stops and an application event log message is created, e.g.:</p>
  
  <pre><code>Faulting application name: w3wp.exe, version: 8.5.9600.16384, time stamp: 0x52157ba0
  Faulting module name: clr.dll, version: 4.7.2117.0, time stamp: 0x59cf5105
  Exception code: 0xc00000fd
  Fault offset: 0x00451a8d
  Faulting process id: 0xe10
  Faulting application start time: 0x01d3a9f540d7b456
  Faulting application path: C:\Windows\SysWOW64\inetsrv\w3wp.exe
  Faulting module path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
  Report Id: 83502af2-15e8-11e8-80ee-005056b72cd8
  Faulting package full name: 
  Faulting package-relative application ID: 
  </code></pre>
  
  <p>Within my code there is no any debugging error or configuration error.
  What will be the problem for that and how handle it?</p>