[eluser]bretticus[/eluser]
[quote author="sabangel" date="1254464459"]In /config/config I just changed this directives:
$config['base_url'] = "http://mysite/site/";
$config['uri_protocol'] = "ORIG_PATH_INFO";
[/quote]
Have you tried changing $config['uri_protocol'] to "AUTO"?
[quote author="sabangel" date="1254464459"]
There are an ".htaccess" file in a directory called "stats" but I can't edit it (server is administrated by three party).
That ".htaccess" just contains the string:
Options +Indexes
[/quote]
This would be an .htaccess file that you are using for making the urls "pretty." Obviously, you don't have apache rewrite in place if you didn't make one. Check and make sure that $config['index_page'] is set to "index.php";
[quote author="sabangel" date="1254464459"]
Should I create my own .htacces?[/quote]
You are not required to, but you may want to take index.php out of the urls so they look more natural (and are not so obviously a framework using PHP. Not that security through obscurity was ever really a great alternative.) Look in the manual and the wikis for more information if you are interested.