Mailer SMTP Error: Could not connect to SMTP host บนเซิฟเวอร์จริง แต่บน localhost ส่งได้

<?php

require_once('class.phpmailer.php');

$name = $_POST[name];
$email = $_POST[email];
$phone=$_POST[phone];
$city=$_POST[city];
$question = $_POST[message];

$mail = new PHPMailer();
$mail->CharSet="utf-8";
$mail->IsHTML(true);
$mail->IsSMTP();
$mail->SMTPAuth = true; // enable SMTP authentication
$mail->SMTPSecure = "ssl"; // sets the prefix to the servier
$mail->Host = "smtp.gmail.com"; // sets GMAIL as the SMTP server
$mail->Port = 465; // set the SMTP port for the GMAIL server
$mail->Username = "[email protected]"; // GMAIL username
$mail->Password = "35798642"; // GMAIL password
$mail->From = $email; // "[email protected]";
//$mail->AddReplyTo = "[email protected]"; // Reply
$mail->FromName = $name;  // set from Name
$mail->Subject = "ข้อความจากผู้ติดต่อทางเว็บไซต์";
$mail->Body = "จากคุณ : ".$name."&nbsp;&nbsp;"."จังหวัด : ".$city."<br/>"."เบอร์โทรศัพท์ : ".$phone."<br/>"."E-mail : ".$email."<hr/>".$question;

$mail->AddAddress("[email protected]"); // to Address

//$mail->AddAttachment("thaicreate/myfile.zip");
//$mail->AddAttachment("thaicreate/myfile2.zip");
//$mail->AddCC("[email protected]", "Mr.Member ShotDev"); //CC
//$mail->AddBCC("[email protected]", "Mr.Member ShotDev"); //CC

$mail->set('X-Priority', '1'); //Priority 1 = High, 3 = Normal, 5 = low

if (!$mail->Send()) {
    echo "Mailer Error: " . $mail->ErrorInfo;
} else {
    echo "<script>
        alert('Ok')
        window.location.href='contact-us.html';
        </script>";
}
?>

<?php
	require_once('class.phpmailer.php');
	$mail = new PHPMailer();
	$mail->IsHTML(true);
	$mail->IsSMTP();
	$mail->SMTPAuth = true; // enable SMTP authentication
	$mail->SMTPSecure = ""; // sets the prefix to the servier
	$mail->Host = "mail.thaicreate.com"; // sets GMAIL as the SMTP server
	$mail->Port = 25; // set the SMTP port for the GMAIL server
	$mail->Username = "[email protected]"; // GMAIL username
	$mail->Password = "xxxxxxx"; // GMAIL password
	$mail->From = "[email protected]"; // "[email protected]";
	//$mail->AddReplyTo = "[email protected]"; // Reply
	$mail->FromName = "Mr.Weerachai Nukitram";  // set from Name
	$mail->Subject = "Test sending mail."; 
	$mail->Body = "My Body & <b>My Description</b>";

	$mail->AddAddress("[email protected]", "Mr.Adisorn Boonsong"); // to Address

	$mail->Send(); 
?>