Login Script working local but not on live environment

I seem to have a problem with a login script, it works on a local php dev box, but not on my live environment, i'm assuming i'm missing something can anyone advise further?

<?php

$user = $_POST["swtorun"];

$pass = $_POST["swtorpw"];



// Generate hash

$enc_pwd = hash('sha256', $pass);



// Connect to DataBase

include('../../settings.php');



$conn = mysql_connect($host,$username,$password);

$db = mysql_select_db($database, $conn);



// mySql Query users

$sql = "SELECT * FROM `users` WHERE username='$user' and password='$enc_pwd'";

$result = mysql_query($sql, $conn);



$count = mysql_num_rows($result); // number of results (should be 1)



if($count==1){

// initiate session

session_start();

$_SESSION['logged'] = "1";

echo "you are now logged in, return to the <a href=\"../../index.php\">index</a>";

} else {

echo "Wrong Username or Password";

}

?>