Having trouble with .net web service and PHP

I'm having trouble when making a soap request to a .NET web service from PHP... I keep getting the following SOAP Fault message "Server was unable to process request. --> Object reference not set to an instance of an object."

Does anyone have any experience with this?
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RurneConnect With a Mentor Commented:
Usually it means you've got a bad reference from the client's URI.  However, it's pretty generic.  What's your remoting code look like?
amagondesAuthor Commented:
Hi, Thanks for the response,


$WSDL = new SOAP_WSDL('authenticationservice.xml');
$client   = $WSDL->getProxy();

$challenge = $client->GetChallenge(PUBLIC_KEY);

WSDL Section
      <s:element name="GetChallenge">
            <s:element minOccurs="0" maxOccurs="1" name="ClientKey" type="s:base64Binary" />

Thanks for the help
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