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Source: http://serverfault.com/a/539036/217375

Did you check your error_log file for php-fpm? Location of that file should be declared in your php-fpm.conf (in Ubuntu config is /etc/php5/fpm/php-fpm.conf, log file is /var/log/php5-fpm/log), also check your log_level, if is disabled (;log_level), please enable it and change it to the debug. After that try restart php5-fpm service and check your logs.

You can also try to run php5-fpm in foreground mode:

# php5-fpm -y /etc/php5/fpm/php-fpm.conf
Maybe this show you something interesting.