Failed to connect to example.com port 8443: Connection refused

[TonyKapa]

Hello, 

I am using cURL to make a GET request to a web service api in a module I am developing.

In localhost the call returns success but when I use it on the online shop I am working for, it returns False and as an error the above title - "Failed to connect to example.com port 8443: Connection refused"

Here is the code in case it's any usefull.

$ch = curl_init();            
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_exec($ch);
$errmsg  = curl_error( $ch );
curl_close($ch);

I'm guessing it's a permission related error caused by prestashop but I don't know how to fix it.

Thanks in advance for your help!