connect() failed (111: Connection refused) while connecting to upstream, client: 111.199.84.121, s

配置好lnmp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”；

如何开启php-fpm还有点问题

查看php-fpm的地址
whereis php-fpm

启动php-fpm

/usr/local/php5/sbin/php-fpm     #  /usr/local/php5/为php-fpm的安装地址

/usr/local/php-5.6.3/sbin/php-fpm -R  # 如果报错显示不能用root用户启动，则可以考虑使用 -R命令

查看是否启动成功：
 
netstat -lnt | grep 9000

tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN

或者使用如下命令，查看是否9000端口被php-fpm占用：

netstat -tunpl | grep 9000

tcp        0      0 127.0.0.1:9000              0.0.0.0:*                   LISTEN      2124/php-fpm

php-fpm 关闭：

kill -INT `cat /usr/local/php5/var/run/php-fpm.pid`

或者：pkill php-fpm
--------------------- 
作者：崖边树 
来源：CSDN 
原文：https://blog.csdn.net/u010716097/article/details/71908096 
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