PHP SoapClient returns NULL (cakephp) - php

Question

So, I have following problem:
I am using plugin CakeSoap for get data from SAP.
If I test with my internal link (in house) it is working, but if I try with external link I am geting following error:
"Failed to open stream: Could not connect because the target computer denied the connection." and "I/O warning : failed to load external entity "http://..."
Also, if I try to load this link directly from browser it is working.
I have read all threads on StackOverflow and in my options parameter "trace" is setted to "true"
here is the example of my connection
private function getDataSAP($SAPcustomerID, $SAPdestinationIDS){
$soap = new CakeSoap([
'wsdl' => Configure::read('SAP_WSDL_CUSTOMER'),
'login' => Configure::read('SAP_USERNAME'),
'password' => Configure::read('SAP_PASS'),
'location' => Configure::read('SAP_WS_CUSTOMER'),
]);
//Collect all products from specific user and his destinations
$all_data = [];
foreach($SAPdestinationIDS as $data){
$all_data[] = $soap->sendRequest('ZGetCustomerData', [
'ZGetCustomerData' => [
'ICustomer' => $SAPcustomerID->customer_number,
'ItLocation' => [
'item' => [
'Servloc' => $data->destination_number
]
]
],
]
);
}
$all_destinations = [];
foreach($all_data as $my_containers){
$all_destinations[] = json_decode(json_encode($my_containers->EtLocation->item), true);
}
return $all_destinations;
}
And there are options from my CakeSoap.php file
$options = [
// 'trace' => Configure::read('debug'),
'trace' => true,
'stream_context' => $context,
'cache_wsdl' => WSDL_CACHE_NONE
];
Additional I have tried to make request using SoapUI software and it is working.
So my question is why this link doesnt work in php?
Thank you for helping!