How to connect database using one not in localhost

[eluser]Miftah Zein[/eluser]
Someone help me, please

I want to develop application that my database is not in the localhost, like this

Code:

$db['default']['hostname'] = "192.168.0.120";

But the application said this

Code:

A Database Error Occurred

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

I've googled it but i got nothing.

can codeigniter using some server database instead of just localhost ?? or maybe something missing?

Thanks before