ksoap2 org.xmlpull.v1.xmlpullparserexception erro start_tag esperado

Abaixo está meu código, que eu escrevi para validar as credenciais de login do usuário. O serviço da Web escrito usando .net

private static final String SOAP_ACTION = "http://tempuri.org/getCredentials";
private static final String OPERATION_NAME = "getCredentials";
private static final String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
private static final String SOAP_ADDRESS = "http://myStaticIP:portNo/WebSiteName/CommunicationInterface.asmx"; 

SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE, OPERATION_NAME);
request.addProperty("username",Username);
request.addProperty("password", Password);

SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
HttpTransportSE httptransport = new HttpTransportSE(SOAP_ADDRESS);

try
{
    httptransport.call(SOAP_ACTION, envelope);
SoapPrimitive result = (SoapPrimitive) envelope.getResponse();
String value = result.toString();
value_LoginWS = value;
val = value;
login_status = Boolean.valueOf(result.toString());

Log.v("CS return value: -", result.toString());
return value;
}
catch (Exception e) 
{
     Log.v("Exception Soap" , e.toString());
}



Na linha"httptransport.call(SOAP_ACTION, envelope)" Eu recebo oexception dizendo

"org.xmlpull.v1.XmlPullParserException: expected: START_TAG {http://schemas.xmlsoap.org/soap/envelope/}Envelope (position:START_TAG <html>
@1:7 in java.io.InputStreamReader@41afb3f0)" <br/><br/>

Eu não tenho ideia do que é o erro. Este trecho de código funciona perfeitamente para o emulador (mudando astaticIP to 10.0.2.2:portNo).

Por favor me ajude a resolver esse problema.

Obrigado.

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