title: "502 Bad Gateway" with passenger
body: <p>I am using rails(2.3.10)/passenger(2.2.15)/nginx(0.7.67) , when i run my application, it give me "502 Bad Gateway" and without any production log, my conf file is :</p>
  
  <pre><code>  1 server {
    2     listen  80;
    3     server_name  www.why.bz;
    4     root   /usr/local/apps/why/pro/public;
    5     access_log  /usr/local/apps/why/pro/log/access.log;
    6     passenger_enabled on;
    7 }
  </code></pre>
  
  <p>who can give me some tips, thanks!</p>