Since you do not have any .htaccess to edit you url you must add an index.php when calling a controller like

http://hello.hostingsiteforfree.com/index.php/loginController

I tried accessing it via the url above and it works, but the database connection is not set up properly

in your config file where there is $config['index_page'] = '' if it is blank add an index.php to it

Check to see it works