Problemer med at hoste en Rest service (WCF) i IIS

Hej jeg har lidt problemer med at hoste min Rest service fra IIS 6 (win 2003)

Jeg har lagt filer ind efter følgende struktur

/dir
  myService.svc
  Web.config
  /bin
      myService.dll

når jeg prøver at kører servicen via min browser kommer den med fejlen:

- <Fault xmlns="http://schemas.microsoft.com/ws/2005/05/envelope/none">
- <Code>
  <Value>Sender</Value>
- <Subcode>
  <Value xmlns:a="http://schemas.microsoft.com/ws/2005/05/addressing/none">a:ActionNotSupported</Value>
  </Subcode>
  </Code>
- <Reason>
  <Text xml:lang="da-DK">The message with Action '' cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None).</Text>
  </Reason>
  </Fault>


Er der nogen der har forslag til hvor/hvordan jeg skal debugge ?

Jeg kan godt bruge http://server/mappe/myService.svc?wsdl og se alle de metoder der er i .dll'en