nginx - another rewrite or internal redirection cycle - drupal

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http://serverfault.com – While migrating a site from another server, some strange problem occured. I use the default configuration for all my drupal sites, but this one doesnt seem to work. Some image files cause an internal server error - rewrite or internal redirection cycle. The site does not have a domain, yet, so I am testing with the server ip, which should not be a problem. When using this configuration for some default drupal installation, everything works fine. I also use memcached for static file caching, you can see that. As already mentioned, all of this should work properly. This is my configuration: se (HowTos)