title: Drupal + Nginx + Php-cgi : 502 Bad Gateway error
body: <p>We are running Drupal 5.x on Nginx with php-fastcgi.
  Things were working fine for a while. All of a sudden, we (users) are running into 502 Bad Gateway error.
  Restarting PHP-cgi, nginx.. rebooting machine etc did not help.</p>
  
  <p>Did anyone else run into this type of issue? What are the possible suspects?</p>