db connection problem

i have a login script and have used it several times. but i'm unable to connect in 1 host
it is known to use PEAR in the code and the config file is:

<?php

function handlePearError($error) {
	header('HTTP/1.0 500 Internal Server Error');
	//die("$error->message<br />$error->userinfo"); // uncomment this to debug
	die('Error ocurred, please try again later');
}


function &db_connect() {
	require_once 'DB.php';
	$dsn = "mysql://user:pass@unix+localhost/db_name";

	$db = DB::connect($dsn);

	if (DB::isError($db)) {
		die("Database connection failed.");
	}

	$db->setFetchMode(DB_FETCHMODE_OBJECT);
	$db->setErrorHandling(PEAR_ERROR_CALLBACK, 'handlePearError');
	
	return $db;
}
?>

PHP:

currently i get this error:
Database connection failed.
why do you think i can't connect to database?
how can i see the error?

 

open DB.php , and check if the database details are entered correct..

 

database details are in config.php:
you saw the line:
$dsn = "mysql://userass@unix+localhost/db_name";
and they are correct

 

oh i hadn't added the user to database