รบกวนสอบถามพี่ๆเรื่อง PHPMailer error ว่า SMTP ERROR: Failed to connect to server: (0)

$name = $_POST['name'] ;
            $subject = $_POST['subject'] ;
            $email = $_POST['email'] ;
            $message = $_POST['message'] ;

            $body = '<br /><br />Name : ' . $name . '<br />Email : ' . $email;

            require 'PHPMailer-master/PHPMailerAutoload.php';

            $mail = new PHPMailer;
            $mail->CharSet = 'UTF-8';

            $mail->isSMTP();                                      
                                                                
            $mail->SMTPDebug = 4;                               
            $mail->Debugoutput = 'html';

            $mail->Host = "*******";  
            $mail->SMTPAuth = true;                               
            $mail->Username = ' ';      
            $mail->Password = ' ';                   
            $mail->SMTPSecure = 'ssl';
            $mail->Port = 25;                                    

            $mail->From = $email;
            $mail->FromName = $name;

            $mail->addReplyTo($email, $name); 

            $mail->addAddress('[email protected]', 'me');    

            $mail->isHTML(true);                                 

            $mail->Subject = 'me Q&A ' . $subject;  
            $mail->Body    = $message . $body;  
            $mail->AltBody = $message;  

            // $mail->Mailer = 'send mail';

            if(!$mail->send()) {
                echo 'Message could not be sent.';
                echo 'Mailer Error: ' . $mail->ErrorInfo;
            } else {
                echo "<script>window.location = 'me.html'</script>";
            }