title: Application Crashes With "Internal Error In The .NET Runtime"
body: <p>We have an application written against .NET 4.0 which over the weekend crashed, putting the following message into the event log:</p>
  
  <blockquote>
    <p>Application: PnrRetrieverService.exe   Framework Version: v4.0.30319<br>
    Description: The process was terminated due to an internal error in
    the .NET Runtime at IP 791F9AAA (79140000) with exit code 80131506.</p>
  </blockquote>
  
  <p>This is on a Windows Server 2003 R2 Standard Edition box.  Googling this error hasn't turned up anything pertinent.  For example, this isn't occurring in VS Studio, but instead on a production box; when the service was eventually restarted, it experienced no further problems.</p>
  
  <p>How does one go about diagnosing a bug in the .NET Runtime?</p>