PHP-cURL outbound call works in localhost but not in AWS hosted website despite allowing all traffic

I am using curl in my wordpress website(hosted on aws linux) to get some info from a few api's. The problem: I get connection timeout from one of the api only. I contacted the api provider as well and they said the api is working fine. The same code was working fine 5 days back.

Now after going through stack, and running some variations, the results are: 1) The same code works in localhost. 2) It also works in postman. 3) The code was copied from Postman to website but still getting timeout. 4) I edited the aws vpn nacl to allow all traffic in both inbound and outbound in addition to the ones recommended by aws, still getting timeout.

This is the basic function I am using, copied from postman and then modified:

function my2get_curl($myurl){
    $curl = curl_init();

    curl_setopt_array($curl, array(
        CURLOPT_URL => $myurl,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => "",
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_CONNECTTIMEOUT => 10,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => "GET",
        CURLOPT_USERAGENT =>$user_agent,
        CURLOPT_HTTPHEADER => array(

                "cache-control: no-cache",
        ),
    ));

    $response = curl_exec($curl);
    $err = curl_error($curl);
    $info = curl_getinfo($curl);
    curl_close($curl);

    if ($err) {
      echo "  cURL Error #:" . $err;
      echo json_encode($info,JSON_PRETTY_PRINT);

      die('');
    } else {
      return $response;
    }
}

Here is the result/curl error (same for http except the port number changes to 80):

    Failed to connect to www.travelpayouts.com port 443: Connection timed out

curl_info:

    { "url": "https:\/\/www.travelpayouts.com\/whereami?locale=en&callback=useriata&ip=<my.ip.address>", "content_type": null, "http_code": 0, "header_size": 0, "request_size": 0, "filetime": -1, "ssl_verify_result": 0, "redirect_count": 0, "total_time": 21.03931, "namelookup_time": 0.066799, "connect_time": 0, "pretransfer_time": 0, "size_upload": 0, "size_download": 0, "speed_download": 0, "speed_upload": 0, "download_content_length": -1, "upload_content_length": -1, "starttransfer_time": 0, "redirect_time": 0, "redirect_url": "", "primary_ip": "", "certinfo": [], "primary_port": 0, "local_ip": "", "local_port": 0 }

Is there something wrong with the code or (more likely) aws settings ? How exactly do i find out whats causing the problem and fix it.

You get this problem because Amazon IPs are closed to access our API. You can send your static IPs in Amazon and we will add them.