title: Strange timeout like error on production server (Network Error(tcp_error))
body: <p>I have an application running for my company that uses very slow scripts. One of the pages used for this is running a SQL query for about 5 minutes then run PHP in about 20 minutes.</p>
  
  <p>After this delay the server sends me an error that says :</p>
  
  <p>Network Error (tcp_error) 
  - 503 error - A communication error occurred: ""</p>
  
  <p>I have already tried to solve the problem by increasing the PHP max execution time without success.</p>
  
  <p>If you want access to the code, I can give it but the code isn't really easy to understand.</p>
  
  <p>Do you know how could I fix this error?</p>