title: Why does the application pool automatically stop?
body: <p>I'm doing performance testing for my MVC internet application using IIS 7.0</p>
  
  <p>Sometimes the application pool stops and I get an error saying "service unavailable" in my browser. I then have to restart the pool.</p>
  
  <p>Why is the pool automatically stopped, and how can I solve this problem?</p>
  
  <p><strong>update</strong>
  And my log file has : "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\webengine4.dll returned an error from registration.  The data is the error." </p>