问题现象：Linux系统服务器php网站环境，网站访问报500错误，通过nginx日志有以下报错信息：

　　recv() failed (104: Connection reset by peer) while reading response header from upstream;

　　问题原因：php-fpm的request_terminate_timeout参数直接杀掉php进程导致

　　解决方法：

　　vi /etc/php-fpm.d/www.conf

　　修改为：

　　; The timeout for serving a single request after which the worker process will

　　; be killed. This option should be used when the ‘max_execution_time’ ini option

　　; does not stop script execution for some reason. A value of ’0′ means ‘off’.

　　; Available units: s(econds)(default), m(inutes), h(ours), or d(ays)

　　; Default Value: 0

　　request_terminate_timeout = 0

　　重启 php-fpm 和 Nginx 服务恢复正常。