Error with php5-fpm

我刚刚安装了nginx和php-fpm，当我试图查看我的一个网站时遇到403错误。当我查看nginx错误日志时，我看到了一些事情，比如权限被拒绝，但我也注意到了这一点：

/var/run/php5-fpm.sock failed (2: no such file or directory)

但是我安装了php-fpm，为什么它要加载php5-fpm？我被难住了，有什么想法吗？

谢谢。

EDIT：default.conf 中的服务器块

server {
listen   81 default_server;
server_name  _;
#charset koi8-r;
#access_log  logs/host.access.log  main;
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location / {
    root   /usr/share/nginx/html;
    index  index.html index.htm;
}
error_page  404              /404.html;
location = /404.html {
    root   /usr/share/nginx/html;
}
# redirect server error pages to the static page /50x.html
#
error_page   500 502 503 504  /50x.html;
location = /50x.html {
    root   /usr/share/nginx/html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ '.php$ {
#    proxy_pass   http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ '.php$ {
#    root           html;
#    fastcgi_pass   127.0.0.1:9000;
#    fastcgi_index  index.php;
#    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
#    include        fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /'.ht {
#    deny  all;
#}

}