title: Upstream prematurely closed FastCGI stdout while reading response header from upstream
body: <p>I suddently get a 502 Bad gateway error and I don't understand why this error appear. This error appear moreover only for 1 single page!!...</p>
  
  <p>The exact error in my Nginx log is :</p>
  
  <pre><code> Upstream prematurely closed FastCGI stdout while reading response header from upstream [..] upstream: "fastcgi://unix:/var/run/php5-fpm.sock:"
  </code></pre>
  
  <p>I tried :</p>
  
  <ul>
  <li>service nginx restart : NOTHING CHANGE</li>
  <li>service php5-fpm restart : NOTHING CHANGE</li>
  <li>to reboot the server : NOTHING CHANGE</li>
  <li>even to restart the mysql service : NOTHING CHANGE</li>
  </ul>
  
  <p>My /var/log/upstart/php5-fpm.log (only a lot of NOTICES) :</p>
  
  <pre><code>Terminating...
  exiting, bye-bye!
  fpm is running, pid 9887
  ready to handle connections
  systemd monitor interval set to 10000ms
  </code></pre>
  
  <p>that makes me crazy, any idea ?</p>