Database connection failure

[eluser]HawkEyez[/eluser]
i'm using codeigniter 1.7...

$active_group = 'default';
$active_record = TRUE;

$db['default']['hostname'] = 'hostname';
$db['default']['username'] = 'username';
$db['default']['password'] = 'password';
$db['default']['database'] = 'database';
$db['default']['dbdriver'] = 'mysqli';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';


i'm using mysqli as dbdriver ( becoz mysqli driver is required to run stored procedures ) but when i try to run application i got the following error


"A Database Error Occurred

Unable to connect to your database server using the provided settings."

Plz if anybody can help?? :question: