Empty object while using PHP SOAP to consume WCF SOAP service

I've got a big problem that I'm fiddling around for several days now :(

Problem is: I need to consume开发者_如何学Python a SOAP service that is provided by some MS WCF server (3rd party server, no access, no debug, no logs, transport secured via https).

WSSE Authentication works like a charme - but every time I send an XML to the server, all data structures are empty. The XML is generated using

new SoapVar( $xml, XSD_ANYXML)

 [...]Envelope, Header, Body etc.[...]
     <tem:CreateAccount>
         <tem:c_id>12345</tem:c_id>
         <tem:newAccount>
             <ser:SomeIntegerValue>123</ser:SomeIntegerValue>
             <ser:SomeStringValue1>foo</ser:SomeStringValue1>
             <ser:SomeStringValue2>bar</ser:SomeStringValue2>
             <ser:SomeStringValue3>foofoo</ser:SomeStringValue3>
         </tem:newAccount>
     </tem:CreateAccount>
 [...]

c_id is perfectly parsed on WCF server side while everything below newAccount is just empty. I've sniffed the network traffic but I don't see any errors on transport level.

If the XML is directly sent to the server without using PHP SOAP, it works like expected.

Any clue where to check?

---

https and WSSE Auth have been disabled for testing - now it works like expected.

But re-enabling https and authentification is crucial for the project :(