正在获取错误消息“；未能连接到live.stellar.org端口9002“-PHP CURL

我收到了这条消息。

无法连接到live.stellar.org端口9002：连接超时

我的代码是，请帮帮我。

$fields = array(
    'method' => 'account_tx',
    'params' => array(
        array(
        'account' => 'gPP3hmC86rA8aJiCwRLXRLd9NxGnL2qSwG',
        'limit' => '20'
        )
        )
);
$data = json_encode($fields);
$response = curl_post($data);
function curl_post($fields)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://live.stellar.org:9002");
    //curl_setopt($ch, CURLOPT_PORT , 9002);
    curl_setopt($ch, CURLOPT_POST, 1); 
    curl_setopt($ch, CURLOPT_POSTFIELDS,$fields);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec ($ch);
    echo curl_error($ch);
    curl_close ($ch); 
    return $response;
}

这是Stellar的API代码：

curl -X POST https://live.stellar.org:9002 -d '
{
  "method": "account_tx",
  "params": [
    {
      "account": "gPP3hmC86rA8aJiCwRLXRLd9NxGnL2qSwG",
      "limit": 4
    }
  ]
}'