how to debug SOAPReader?

On our production-server I get this error if I want to load an
HTTP-connector-stream into the SoapReader:

ERROR 5051: Application-defined or object-defined error

my code looks like this:

  Set Serializer = New SoapSerializer
    Serializer.Init Connector.InputStream
    Serializer.startEnvelope "SOAP-ENV", SOAP_ENCODING_STYLE_URI
    Serializer.startBody
    Serializer.startElement SOAP_METHOD_EXECUTE,
SOAP_WRAPPER_ELEMENT_NAMESPACE, , "SOAPSDK1"
    Serializer.startElement "farmName"
    Serializer.writeString strFarmName
    Serializer.endElement
    Serializer.startElement "requestXML"
    Serializer.writeString strRequest
    Serializer.endElement
    Serializer.endElement
    Serializer.endBody
    Serializer.endEnvelope
    Connector.EndMessage
    Set Reader = New SoapReader
    Reader.Load Connector.OutputStream
    If Not Reader.Fault Is Nothing Then
        Err.Raise -1, "Soap", Reader.Fault.xml
        ...
        (here it jumps into the if-clause)

- strFarmName and strRequest were filled fine.
- I am using SOAP 3.

Is there any way to find out if the SOAP-installation went fine?

regards, Ragnar