loop redirect after server update

Hello everyone!
I upgrade my VPS from Debian Lenny to Debian Wheezy
All updates was install correct, but i cought trouble with one wordpress site due loop redirect, also i have another sites installed on this server, these sites work on phpbb and modx. Phpbb after updates still work without any changes or tuning, for modx i change one package from php-mysql to php-mysqlnd.
Wordpress site:
Administrator panel work, also domain.ru/readme.html open correctly. Error log is empty, I not have .htaccess for this site
Config files
Nginx

server {
        listen   80;
        server_name domain.ru;

        access_log  /var/log/nginx/domain.access.log;
        error_log       /var/log/nginx/domain.ru.error.log;
        location / {
                root   /var/www/domain.ru;
                index  index.php;
        }

        location ~ \.php($|\/) {
                proxy_pass  http://backend;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $remote_addr;
        }
        location ~* \.(jpg|jpeg|gif|png|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|tar|wav|bmp|rtf|swf|ico|flv|txt|xml|docx|xlsx)$ {
                root   /var/www/domain.ru;
        }
}

Apache

<VirtualHost 127.0.0.1:81>
        DocumentRoot "/var/www/domain.ru/"
        ServerName domain.ru
        ServerAlias www.domain.ru
        ErrorLog /var/log/apache2/domain.ru.error.log
        php_admin_value open_basedir "/var/www:."
</VirtualHost>

Also i try install new copy of wordpress, but some result
I think this issue can be due some troubles with Data base.
Also for troubleshooting of server side i invited Debian Guru, we try find reason more two hours, no results.
I try connect to site via telnet this work perfect.
Thank you in advance!