This db connection is failing to connect though it runs smooyh in localhost

<?php $host="localhost"; // Host name $username="id664XXX6_xxx"; // Mysql username $password="YYYYY"; // Mysql password $db_name="id664XXX6_test"; // Database name $tbl_name="xxxxx"; // Table name // Connect to server and select databse. mysql_connect("$host", "$username", "$password")or die("cannot connect"); mysql_select_db("$db_name")or die("cannot select DB"); // username and password sent from form $myusername=$_POST['myusername']; $mypassword=$_POST['mypassword']; // To protect MySQL injection (more detail about MySQL injection) $myusername = stripslashes($myusername); $mypassword = stripslashes($mypassword); $myusername = mysql_real_escape_string($myusername); $mypassword = mysql_real_escape_string($mypassword); $sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'"; $result=mysql_query($sql); // Mysql_num_row is counting table row $count=mysql_num_rows($result); // If result matched $myusername and $mypassword, table row must be 1 row if($count==1){ // Register $myusername, $mypassword and redirect to file "login_success.php" $_SESSION['myusername']="username"; $_SESSION['myusername']="password"; header("location:login_success.php"); } else { echo "Wrong Username or Password"; } ?>

Well, give us the error you get atleast…