PHP - SOAP WSDL - php

Question

Currently i'm trying to build a little PHP - Soap Connector, which worked pretty good so far. But when i'm deploying my little script to my server, it won't work anymore and i have no clue, why.
I'm connecting in 2 different ways (by curling the SOAP WSDL Scheme, and saving it temporary in the script location, and creating from that a new SOAP Client, and creating a SOAP Client directly by using the SOAP WSDL Scheme URL):
$opts = array(
'http'=>array(
'user_agent' => 'PHP Soap Client'
)
);
$context = stream_context_create($opts);
// SOAP 1.2 client
$params = array (
'encoding' => 'UTF-8',
'verifypeer' => false,
'verifyhost' => false,
'soap_version' => SOAP_1_2,
'trace' => 1,
'exceptions' => 1,
'connection_timeout' => 30,
);
$curlStuff = curl_init($soapURL);
curl_setopt($curlStuff,CURLOPT_RETURNTRANSFER,true);
curl_setopt($curlStuff,CURLOPT_FOLLOWLOCATION,true);
curl_setopt($curlStuff,CURLOPT_TIMEOUT,30);
$response = curl_exec($curlStuff);
$info = curl_getinfo($curlStuff);
if($response) {
file_put_contents("./tempSoapScheme.wsdl", $response);
}
$soapClient = new SoapClient(
'./tempSoapScheme.wsdl',
array(
'trace' => 1,
'stream_context' => $context,
'cache_wsdl' => WSDL_CACHE_NONE
)
);
$soapClientTwo = new SoapClient(
$soapURL,
array(
'trace' => 1,
'stream_context' => $context,
'cache_wsdl' => WSDL_CACHE_NONE
)
);
$result = $soapClient->myLoginMethod(
array(
'username' => 'my#email.example',
'password' => 'password'
)
);
As i said earlier - on my local machine it works like a charm, and everything is fine. The param "soapURL", which is not inside the script, is just the https path to my SOAP WSDL Scheme.
I've tried different options inside "$params" array, other curl setopt settings, but i can't make it work.
The response from both SoapClients:
SOAP-ERROR: Parsing WSDL: Couldn't load from '<MyURL>' : failed to load external entity "<MyURL>", which is pretty uncommon, because the CURL could save everything.
Do you have any suggestions for me?
EDIT - forgot the most important thing:
- The server, which should execute the script, has very strong firewall restrictions, and the SOAP URL Scheme is on another server (not the same). And i guess, that is the point, why it won't work, but i receive an answer from the Scheme by executing CURL.. So it's just SOAP?