Browsers can retrieve the content of this URL, but Snoopy can not

[ECF.com]

This works :

require('Snoopy.class.php');
$snoopy = new Snoopy;
$snoopy->fetch("http://www.restfulwebservices.net/wcf/StockQuoteService.svc?wsdl");
echo "<script>alert('";
echo $snoopy->results;
echo "')</script>";

But with this URL it does not work :

require('Snoopy.class.php');
$snoopy2 = new Snoopy;
$snoopy2->fetch("http://217.119.180.158:50004/NvpSIRIWebService/ServiceSIRIProducer.svc?wsdl");
echo "<script>alert('";
echo $snoopy2->results;
echo "')</script>";

Browsers can show the content of this second URL. Why Snoopy can not ?