Parsing WSDL: Couldn’t load from https

I have a PHP code that allows me to connect to a webservice:

<?php

$client = new SoapClient("https://ws.chronopost.fr/shipping-cxf/ShippingServiceWS?wsdl");

?>

When I do it, I get the error
"Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://ws.chronopost.fr/shipping-cxf/ShippingServiceWS?wsdl' : failed to load external entity "https://ws.chronopost.fr/shipping-cxf/ShippingServiceWS?wsdl" in C:..."

I have an old web server running PHP 5.3.9. In the PHP.ini saop is activated:

enter image description here

If I open the page https://ws.chronopost.fr/shipping-cxf/ShippingServiceWS?wsdl on a server browser, it works correctly.

What is the cause of the error?
Thanks for your help,