远程服务器上的curl访问被拒绝

我正在为android开发推送通知服务，并遵循了一些教程。我尝试在localhost中实现该技术，并取得了成功。但是，当我尝试使用远程服务器时，它会给我错误"卷曲失败：连接失败：权限被拒绝"。我不知道它出了什么问题。我试着寻找解决方案，但没有一个奏效。以下是我的步骤。

我为云消息创建了一个名为GCM的数据库在publish_content.php页面中添加了以下代码行

$username = "given";
            $password = "given";
            $hostname = "localhost"; 
            //connection to the database
            $dbhandle = mysql_connect($hostname, $username, $password) 
             or die("Unable to connect to MySQL");
//          echo "Connected to MySQL<br>";
            //select a database to work with
            $selected = mysql_select_db("gcm",$dbhandle) 
              or die("Could not select examples");

            //execute the SQL query and return records
            $result = mysql_query("SELECT gcm_regid FROM gcm_users");
            $regIds = array();
            include_once 'GCM.php';
            //fetch tha data from the database 
            while ($row = mysql_fetch_array($result)) {
                array_push($regIds, $row['gcm_regid']);
            }
            foreach($regIds as $item) {
                $gcm = new GCM();
                $registatoin_ids = array($item);
                    $message = array("price" => $message1);
                $result = $gcm->send_notification($registatoin_ids, $message);
            }
            //close the connection
            mysql_close($dbhandle);

GCM.php

<?php
class GCM {
    //put your code here
    // constructor
    function __construct() {
    }
    /**
     * Sending Push Notification
     */
    public function send_notification($registatoin_ids, $message) {
        // include config
        include_once './config.php';
        // Set POST variables
        $url = 'https://android.googleapis.com/gcm/send';
        $fields = array(
            'registration_ids' => $registatoin_ids,
            'data' => $message,
        );
        $headers = array(
            'Authorization: key=' . GOOGLE_API_KEY,
            'Content-Type: application/json'
        );
        // Open connection
        $ch = curl_init();
        // Set the url, number of POST vars, POST data
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        // Disabling SSL Certificate support temporarly
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
        // Execute post
        $result = curl_exec($ch);
        if ($result === FALSE) {
            die('Curl failed: ' . curl_error($ch));
        }
        // Close connection
        curl_close($ch);
        echo $result;
    }
}
?>

它连接到mysql，然后显示错误。请帮我一下。