Nginx load balance with dedicated php-fpm server

I got server setup with nginx+php-fpm and mysql. I have another server with only installed php-fpm, so wanted to use as load balance. But when I am using this dedicated server with php-fpm as load balancer, I got an error when opening page: "Access denied."

/etc/nginx/nginx.conf

user www-data;
worker_processes  3;

error_log  /var/log/nginx/error.log;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    server_names_hash_bucket_size 64;
    access_log  /var/log/nginx/access.log;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;
    tcp_nodelay        on;

    #gzip                on;

upstream php {
server dedicatedserverip:9000;
}

include /etc/nginx/sites-enabled/*;
}

/etc/nginx/sites-enabled/site.org.conf

server {
        listen   81;
        server_name site.org www.site.org;
        access_log  /var/log/nginx/site.org.log;
        error_log  /var/log/nginx/site.org.log;
root /home/www/site.org;
index  index.php;




   location ~ .php$ {
      fastcgi_pass php;
      fastcgi_index index.php;
            fastcgi_param  SCRIPT_FILENAME    /home/www/$fastcgi_script_name;
        }


} 

Why did I get this error? When I change only the fastcgi_pass to 127.0.0.1:9000 - all work fine.

Find your php-fpm configuration (default source install location is /usr/local/etc/php-fpm.conf) and make sure that listen.allowed_clients is set to allow the IP of your Nginx box.

If this doesn't fix it then check your Nginx error log for further details.