Web Service config for Orchestration

Hi all, first post here and only using BizTalk for 3 months!

I have created a very simple orchestration which receives an XML message, populates some parameters in the message and returns it whence it came.  I want to expose this as a Web Service.  I have run the Web Service Publishing wizard which has created a web service on the same server which BizTalk is on (but this isnt the development machine with VS2005).  I cant run the auto create the port option in the wizard as Group is not properly config on my dev box due to some system permission which I am unable to change in the short term. The Web Service exists at

http://biztalk02/B2BService/Validation/B2B_Processing_Validation_Port_Validation.asmx and I get a WSDL file from the service which correlates to the original defined inbound message OK, the service runs in the "MyAppPool" application pool which runs under the wssBiztalk02 account.

So…..

I have created a Request/Response receive port which the Orchestration is bound to and I have attached the Port to a SOAP Location which has XML Recieve and XML Transmit pipelines, I have also tried the Location with PassThruReceive/Transmit as well.  In the Transport Properties tab the Virtual directory is

/B2BService/Validation/B2B_Processing_Validation_Port_Validation.asmx 

and the Public address is

/B2BService/Validation/B2B_Processing_Validation_Port_Validation.asmx 

when I send in a message I get the following response from the service

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-ins
tance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>Internal SOAP Processing Failure<
/faultstring><detail /></soap:Fault></soap:Body></soap:Envelope>

There are no hydrated or suspended orchestrations in BiztTalk and no sign of any messages.

 I am stuck as I cant attach VS to the remote web service and cant find any sign of life!

If anyone has any ideas then I'd be over the moon