Codeigniter + Nginx + php-fpm = 502 error

i’ve tried several configuration instructions and forum posts but nothing worked for me, I still get 502-bad gateway errors when I try to access my website.

$config[“index_page”] = “”;

...

$config[“uri_protocol”] = “REQUEST_URI”; // also tried AUTO

My nginx configuration:

server {
    server_name     dev.monitr.io;
    root            /home/monitr/web/dev/www/;
    include         /etc/sites/ci_vhost;
} 

/etc/sites/ci_vhost:

index index.html index.php index.htm;

# set expiration of assets to MAX for caching
location ~* \.(ico|css|js|gif|jpe?g|png)(\?[0-9]+)?$ {
 expires max;
 log_not_found off;
}

location / {
 # Check if a file exists, or route it to index.php.
 try_files $uri $uri/ @rewrites;
}

location @rewrites {
        if (!-e $request_filename)
        {
            rewrite ^/(.*)$ /index.php/$1 last;
            break;
        }
    }

   location ~ \.php {
        include /etc/nginx/fastcgi_params;

        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
        fastcgi_param SCRIPT_NAME $fastcgi_script_name;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_pass unix:/var/run/php-fastcgi/php-fastcgi.socket;
        fastcgi_index index.php;
} 

kind regards, phillip