Issue with Nginx WPMultiSite

Hi,
I have a WP MultiSite and it works fine, except for a little issue…
In my server I have Debian Lenny (jeje yep, old-stable jaja), MySQL, PHP5 and of course Nginx (nginx works better than apache, I make some tests and the results were awesome).
Well… multisites works almost perfect as I said: when I upload an image into a post or page I can′t see it, for example the link to the image is:
https://www.midomain.net/news/files/2011/03/picture.png
https://www.midomain.net = MainSite
news = “secundary” site

But, when I introduce the URL on my browser (firefox, chromium, etc) I have this error:
No input file specified

After a big search in Google, I think that the problem is in my vhost config, which I’m leaving here:

server {
  listen 80;
  server_name www.ipichcb.rimed.cu;
  root /var/www/ipichcb;
  index index.php;

  location ~ \.php$ {
    fastcgi_pass 127.0.0.1:9000;
    include /etc/nginx/fastcgi_params;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  }
    rewrite  ^.*/files/(.*) /wp-content/blogs.php?file=$1;

if (!-e $request_filename) {
 rewrite  ^.+?(/wp-.*)     $1          last;
 rewrite  ^.+?(/.*\.php)$  $1          last;
 rewrite  ^               /index.php  last;
}
}

After trying to figure this out for myself (and obviously I couldn’t), I came here for help. Surely, the solution is simple, but I just can′t see it..
I want to specify that in my laptop (archlinux+httpd) all works perfect (but I don′t want to change nginx for apache in my servers). That′s the main reason for me to think that the problem is on my vhost’s configuration from my nginx server.

Thanks for all, I will appreciate the help that any user could give me.

Greetings.