Connection reset by peer) while reading response header from upstream

[Siava]

Добрый день.
Nginx использую для отдачи статики.
На днях обновил свой Slackware с 11 до 12 версии, перекомпилировал nginx 
и тут же, с первого дня в error.log посыпались переодические ошибки 
такого вида:

2007/07/17 20:42:00 [error] 7185#0: *141070 recv() failed (104: 
Connection reset by peer) while reading response header from upstream, 
client: 74.6.87.23, server: siava.ru, URL: "/forum/topic2654.html", 
upstream: "http://127.0.0.1:5005/forum/topic2654.html", host: "siava.ru"
2007/07/17 20:42:00 [error] 7183#0: *141012 recv() failed (104: 
Connection reset by peer) while reading response header from upstream, 
client: 213.158.12.37, server: siava.ru, URL: 
"/forum/album_thumbnail.php?pic_id=15", upstream: 
"http://127.0.0.1:5005/forum/album_thumbnail.php?pic_id=15", host: 
"siava.ru", referrer: "http://siava.ru/forum/"
.....

Не понимаю откуда они берутся, пробовал менять конфиг (увеличил 
keepalive_timeout с 0 до 30, не помогло) , кстати, прилагаю его:


user  nobody;
worker_processes  4;

events {
    worker_connections  1024;
}


http {
    include    conf/mime.types;
    default_type    application/octet-stream;

    log_format  main    '$remote_addr - $remote_user [$time_local] 
$request '
                '"$status" $body_bytes_sent "$http_referer" '
                '"$http_user_agent" "$http_x_forwarded_for" ';

    access_log  logs/access.log  main;

    sendfile        on;
    tcp_nopush        on;
    tcp_nodelay        on;

    keepalive_timeout    30;

    server {
    listen            80;
    server_name        siava.ru    max_fails=2    fail_timeout=20s;

    access_log        off;
    log_not_found        off;

        location / {
        proxy_pass        http://127.0.0.1:5005/;
        proxy_redirect        off;

        proxy_set_header    Host            $host;
        proxy_set_header    X-Real-IP        $remote_addr;
        proxy_set_header    X-Forwarded-For    $proxy_add_x_forwarded_for;

        client_max_body_size        250m;
        client_body_buffer_size        128k;

        proxy_connect_timeout        20;
        proxy_send_timeout        60;
        proxy_read_timeout        300;

        proxy_buffering            on;
        proxy_buffer_size        16k;
        proxy_buffers            4 32k;
        proxy_busy_buffers_size        64k;
        proxy_temp_file_write_size    64k;
        }


        location ~* 
^.+\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|tar|wav|bmp|rtf|js)$ 
{
            root /usr/local/www/siava.spb.ru;
            expires      30d;
        }
   
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

}

-- 
Siava
WEB http://siava.ru