502 Bad Gatewa

Hello,
Can sameone help me, I have all the time 502 Bad Gateway when I make pr or similar functions. Besides this everything works fine.

error.log

2015/06/06 14:34:20 [error] 11591#0: *15 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 83.238.276.91, server: domena.pl, request: "POST /users/login HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "domena.pl", referrer: "http://domena.pl/users/login"

nginx

server {
    listen 80 default_server;
    listen [::]:80 default_server ipv6only=on;

    root /www/domena.pl/htdocs/webroot;
    index index.php index.html index.htm;

    server_name domena.pl www.domena.pl;

    access_log /www/domena.pl/logs/access.log;
    error_log /www/domena.pl/logs/error.log;

   location / {
        index  index.php index.html index.htm;
        try_files $uri $uri/ /index.php?$uri&$args;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

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