nginx1.10.3出现502 Bad Gateway只重重启计算机才能正常

环境centos7 + php5.5 + mysql5.7 + nginx1.10.3 systemctl status php-fpmsystemctl status nginx systemctl status firewalld都是运行中的 systemctl restart php-fpmsystemctl restart nginx systemctl restart firewalld 重启3个服务，依然无法运行 ===== ...