卷曲错误：无法连接到 <url> 端口8444：连接被拒绝，只能在本地运行，但不能在服务器上运行

Question

I am trying to integrate bank online payment system. For that I need to make handshake with bank server.With crt and key file i have done it in localhost with curl,sending crt and key file to band server while performing handshake and they approved it.But somehow when I upload the project in server it give error "Curl Error : Failed to connect to port : Connection refused" , i want to know what might cause this problem, do i need to store crt and key file in specific folder? the website is ssl certified. my curl code is:

$request = <has xml file>
    $twpg_gateway_url = <url>;
    $twpg_cert_file = getcwd().'\wp-content\themes\nikkon\website.com.crt';
    //echo getcwd();exit();
    $twpg_key_file = getcwd().'\wp-content\themes\nikkon\website.key';
    $twpg_key_password = <password>;
    $curl = curl_init();

    $options = array(
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_HEADER => false,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_SSL_VERIFYHOST => false,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_POST => true,
        CURLOPT_USERAGENT => 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)',
        CURLOPT_VERBOSE        => true,
        CURLOPT_URL => $twpg_gateway_url . '/Exec',
        CURLOPT_POSTFIELDS => $request,
        CURLOPT_HTTPHEADER => array('Content-Type: text/xml'),
        CURLOPT_TIMEOUT => 30
    );

    if ($twpg_cert_file != '') {
        $options[CURLOPT_SSLCERT] = $twpg_cert_file;
        $options[CURLOPT_SSLKEY] = $twpg_key_file;
        $options[CURLOPT_SSLKEYPASSWD] = $twpg_key_password;
    }

    curl_setopt_array($curl, $options);

    $response = curl_exec($curl);
    if(!$response)
    {
        echo "Curl Error : " . curl_error($curl);
    }
    curl_close($curl);

    return $response;

Answer 1

This is a script I use to test if a port is open.

try {
    $hostname = isset($_SERVER['argv'][1])? $_SERVER['argv'][1]: 'localhost';
    $port = isset($_SERVER['argv'][2])? $_SERVER['argv'][2]: 80;

    printf(' ? Attempting to connect to: %s:%u', $hostname, $port);

    if(@fsockopen($hostname, $port, $code, $message, 5) === false) {
        throw new RuntimeException($message, $code);
    }

    printf("\r:) Successfully connected to: %s:%u", $hostname, $port);
}
catch(Exception $e) {
    printf("\nError: %u - %s", $e->getCode(), $e->getMessage());
    exit(1);
}

Run it like this from the command line php socket-test.php example.com 25 . Or you could modify it to work in a web browser.