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Asked: 2026-05-10T13:30:12+00:00

I’ve created a WCF service and when I browse to the endpoint I get

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I’ve created a WCF service and when I browse to the endpoint I get the following fault:

<s:Envelope xmlns:s='http://schemas.xmlsoap.org/soap/envelope/'>   <s:Body>     <s:Fault>       <faultcode              xmlns:a='http://schemas.microsoft.com/ws/2005/05/addressing/none'>             a:ActionNotSupported       </faultcode>        <faultstring xml:lang='en-GB'>             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).       </faultstring>      </s:Fault>   </s:Body> </s:Envelope>

I’ve fixed the problem but didn’t enjoy the experience! Does anyone have any tips or tools for debugging problems like this?

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1 Answer

  1. I’ve found SvcTraceViewer.exe to be the most valuable tool when it comes to diagnosing WCF errors.

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