我将nginx更新到1.4.7，将php更新到5.5.12，之后我得到了502错误。在我更新之前，一切都很好。
nginx-error.log
2014/05/03 13:27:41 [crit] 4202#0: *1 connect() to unix:/var/run/php5-fpm.sock failed (13: Permission denied) while connecting to upstream, client: xx.xxx.xx.xx, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "xx.xx.xx.xx"
nginx.conf
user www www;
worker_processes 1;
location / {
root /usr/home/user/public_html;
index index.php index.html index.htm;
}
location ~ [^/]\.php(/|$) {
fastcgi_split_path_info ^(.+?\.php)(/.*)$;
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /usr/home/user/public_html$fastcgi_script_name;
include fastcgi_params;
}
下面的简单修复对我有用，绕过了套接字可能的权限问题。
在你的nginx配置中，设置fastcgi_pass为:
fastcgi_pass 127.0.0.1:9000;
而不是
fastcgi_pass /var/run/php5-fpm.sock;
这必须匹配/etc/php5/fpm/pool.d/www.conf中的listen =参数，所以也将其设置为:
listen = 127.0.0.1:9000;
然后重新启动php5-fpm和nginx
service php5-fpm restart
And
service nginx restart
更多信息，请参见:https://wildlyinaccurate.com/solving-502-bad-gateway-with-nginx-php-fpm/
如果你已经尝试了这篇文章中的所有内容，但都没有成功地让PHP工作，这是为我的案例修复的:
确保在/etc/php5/fpm/pool.d/www.conf中没有注释这些行:
listen.owner = www-data
listen.group = www-data
listen.mode = 0660
确保/etc/nginx/fastcgi_params看起来像这样:
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param PATH_INFO $fastcgi_script_name;
fastcgi_param HTTPS $https if_not_empty;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;
这两行在我的/etc/nginx/fastcgi_params中丢失了，请确保它们在那里!
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_script_name;
然后重新启动php5-fpm和nginx。应该能行。
@Xander的解决方案工作，但不坚持后重启。
我发现我必须改变听。Mode到“/etc/php5/fpm/pool.d/www.conf”中的0660。
样本来自www.conf:
; Set permissions for unix socket, if one is used. In Linux, read/write
; permissions must be set in order to allow connections from a web server. Many
; BSD-derived systems allow connections regardless of permissions.
; Default Values: user and group are set as the running user
; mode is set to 0660
;listen.owner = www-data
;listen.group = www-data
;listen.mode = 0660
编辑:根据@Chris Burgess，我已经将此更改为更安全的方法。
我删除了这条评论。模式，.group和.owner:
listen.owner = www-data
listen.group = www-data
listen.mode = 0660
/var/run仅保存上次引导后运行的系统信息，例如当前登录的用户和正在运行的守护进程。(http://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard # Directory_structure)。
注:
我的php5-fpm -v报告:PHP 5.4.28-1+deb.sury.org~精确+1。在最近的一次更新之后，这个问题也发生了。
