codeigniter 404 error on live server

use the following
in config.php

$config['base_url'] = '';
$config['index_page'] = '';
$config['uri_protocol'] = 'AUTO';
$config['url_suffix'] = '';

in .htaccess (This should place out side application folder)

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>

in autoload.php

$autoload['helper'] = array('url');