Cannot connect from dreamweaver cs5.5 to mysql using the mysql connection wizard

Cannot connect from dreamweaver cs5.5 to mysql using the mysql connection wizard error Http error 403 or 500 internal server error. I am using ubuntu mysql.

a manual php script work fine

<?php

// open connection to mysql server
$dbc = mysql_connect('localhost','root','password');
if (!$dbc) {
            die('Not Connected' . mysql_error ());
           }
//select database
$db_selected = mysql_select_db ("msinventory",$dbc);
if (!$db_selected)
{
        die('Cannot Connect' . mysql_error());
}

echo "TEST DONE1";
?>

but the database connection wizard fails with http error 403 or 500

i also use the HeidiSQL client and it works, the only problem is in dreamweaver.