http://forum.nginx.org/read.php?5,245516
http://trac.nginx.org/nginx/ticket/496
http://stackoverflow.com/questions/14167910/nginx-and-mysql-timeout-upstream-timed-out-110-connection-timed-out
http://howtounix.info/howto/110-connection-timed-out-error-in-nginx
http://trac.nginx.org/nginx/ticket/496
http://stackoverflow.com/questions/14167910/nginx-and-mysql-timeout-upstream-timed-out-110-connection-timed-out
http://howtounix.info/howto/110-connection-timed-out-error-in-nginx