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配置好lamp后，在浏览器中运行程序后，出现上面的错误。
转自：http://www.xuejiehome.com/blread-1828.html
I‘m experiencing 502 gateway errors when accessing a PHP file in a directory (http://domain.com/dev/index.php), the logs simply says this:
2011/09/30 23:47:54 [error] 31160#0: *35 connect() failed (111: Connection refused) while connecting to upstream, client: xx.xx.xx.xx, server: domain.com, request: \"GET /dev/ HTTP/1.1\", upstream: \"fastcgi://127.0.0.1:9000\", host: \"domain.com\"
The answer:
It sounds like you haven‘t started and configured backend for Nginx. Start php-fpm and add the following to nginx.conf, in http context:
server { listen 127.0.0.1; server_name localhost; error_log /var/log/nginx/localhost.error_log info; root /usr/local/nginx/html; location ~ \\.php$ { root html;#此处和server下面root保持一致,默认为html fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /usr/local/nginx/html/$fastcgi_script_name; include fastcgi_params; } }
大概意思是你没有启动或者配置php-fpm.其中“/usr/local/nginx/html”为网站根目录。
而我刚好是没有启动php-fpm,在终端运行“service php-fpm start”；
ok，正常运行了。
connect() failed (111: Connection refused) while connecting to upstream
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原文地址：http://www.cnblogs.com/wangkongming/p/4290587.html
