[i18n] DB Error: connect failed

[David Chang]

Hi all:
everytime i run babel,the error message was shown:
DB Error: connect failed

Here are my config info
=======================
$conf['storage']['driver'] = 'sql';
$conf['storage']['params'] = array();
$conf['storage']['params']['phptype'] = 'mysql';
$conf['storage']['params']['hostspec'] = 'example.com.tw';
$conf['storage']['params']['protocol'] = 'tcp';
$conf['storage']['params']['username'] = 'root';
$conf['storage']['params']['password'] = 'root';
$conf['storage']['params']['database'] = 'i18n';