I can't connect to mysql

[eluser]mikevu[/eluser]
Hello everyone,
all my code is done in my localhost (my PC). But it is don't connect to mysql in my host when I deploy in my host.
mysql in this is host using port 3307.
This is my database config.

Code:

$db['default']['hostname'] = "localhost";
$db['default']['port'] = "3307";
$db['default']['username'] = "root";
$db['default']['password'] = "xxxroot";
$db['default']['database'] = "vos_xxx";
$db['default']['dbdriver'] = "mysql";
$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";

Some site in this host is done very well
any one help me?
Thank you so much.