wsdl error: HTTP ERROR: cURL ERROR: 7: couldn't connect to host

<?php
// include the SOAP classes
require_once('nusoap/nusoap.php');

// create the server object
$server = new soap_server;

// Initialize WSDL support
$server->configureWSDL('data_transferwsdl', 'urn:data_transferwsdl');

// Register the method to expose
$server->register('data_transfer',            // method name
	array('nd4_request' => 'xsd:string'),  			// input parameters
	array('return' => 'xsd:string'),  					// output parameters
	'urn:data_transferwsdl',                    // namespace
	'urn:data_transferwsdl#data_transfer',      // soapaction
	'rpc',                                			// style
	'encoded',                            			// use
	'data_transfer'            									// documentation
);
// Define the method as a PHP function
function data_transfer($request) 
{
	$obj_xml = simplexml_load_string($request);
	return '<?xml version="1.0" encoding="ISO-8859-1" ?><nd4_response><user>' . $obj_xml->orderDeliveredRequestMessage->BESTELLUNG->PROSPEKT[0]->VERSANDDATUM . '</user></nd4_response>';
}

// Use the request to (try to) invoke the service
$HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
$server->service($HTTP_RAW_POST_DATA);
?>

<?php
// include the SOAP classes
require_once('nusoap/nusoap.php');

$client = new soapclient('https://meineURL.eu/server.php?wsdl', true);

// Check for an error
$err = $client->getError();
if ($err) 
{
	// Display the error
	echo '<h2>Constructor error</h2><pre>' . $err . '</pre>';
	// At this point, you know the call that follows will fail
}
// Call the SOAP method
$test = '<?xml version="1.0" encoding="ISO-8859-1" ?>
		<nd4_request>
			<action>orderDelivered</action>
			<orderDeliveredRequestMessage>
				<BESTELLUNG bestellid="1">
					<PROSPEKT>
						<WM_ID>1</WM_ID>
						<VERSANDDATUM>12.12.08</VERSANDDATUM>			
					</PROSPEKT>
					<PROSPEKT>
						<WM_ID>2</WM_ID>
						<VERSANDDATUM>12.12.08</VERSANDDATUM>			
					</PROSPEKT>
				</BESTELLUNG>
			</orderDeliveredRequestMessage>
		</nd4_request>
';

$result = $client->call('data_transfer', array('nd4_request' => utf8_encode($test)));

// Check for a fault
if ($client->fault) 
{
	echo '<h2>Fault</h2><pre>';
	print_r($result);
	echo '</pre>';
} 
else 
{
	// Check for errors
	$err = $client->getError();
	if ($err) 
	{
		// Display the error
		echo '<h2>Error</h2><pre>' . $err . '</pre>';
	} 
	else 
	{
		// Display the result
		echo '<h2>Result</h2><pre>';
		print_r(htmlentities($result));
		echo '</pre>';
	}
}
// Display the request and response
echo '<h2>Request</h2>';
echo '<pre>' . htmlspecialchars($client->request, ENT_QUOTES) . '</pre>';
echo '<h2>Response</h2>';
echo '<pre>' . htmlspecialchars($client->response, ENT_QUOTES) . '</pre>';
// Display the debug messages
echo '<h2>Debug</h2>';
echo '<pre>' . htmlspecialchars($client->debug_str, ENT_QUOTES) . '</pre>';
?>