Ngix sitemap returns 404 and sitemap

Hello,

So i’ve seen similar topic to the problem I have
http://wordpress.org/support/topic/sitemap-with-nginx-getting-404-and-the-content?replies=3
so yes when I go to mysite.com/sitemap.xml I get the sitemap but when I try adding it to Webmaster tools / fetch it as google it returns with 404

HTTP/1.1 404 Not Found
Server: nginx/1.2.3
Date: Wed, 19 Sep 2012 14:34:46 GMT
Content-Type: text/xml
Transfer-Encoding: chunked
Connection: keep-alive
X-Powered-By: PHP/5.2.17
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Set-Cookie: PHPSESSID=8535580eea2aab79054380005ea8e41f; path=/

and was wondering if anyone could please help me out what that?

Piotr.