fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;

fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;

fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;

fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;

location ~ .php$ {
fastcgi_intercept_errors on;
fastcgi_pass xx.xx.xx.xx:yyyy; # ip:port спрятал
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /var/www$fastcgi_script_name;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
}

Это как ногу под башмак подпиливать...

cgi.fix_pathinfo = 1

fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;

[FCGI_ROLE] => RESPONDER
[SCRIPT_FILENAME] => /home/someuser/www/phpmyadmin/in dex.php
[QUERY_STRING] =>
[REQUEST_METHOD] => GET
[CONTENT_TYPE] =>
[CONTENT_LENGTH] =>
[HTTP_HOST] => site.com:80
[HTTP_IF_MODIFIED_SINCE] => Tue, 12 Jul 2011 17:22:30 GMT
[HTTP_CACHE_CONTROL] => max-age=0
[PHP_SELF] =>
[REQUEST_TIME] => 1310500401
[argv] => Array
(
)

include fastcgi_params;

include fastcgi_params_php;

fastcgi_param PHP_SELF $fastcgi_script_name;

Есть. В нем то же что и в конфе

sites-available

Ничего - это не апач, и апача там вообще нет...