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WCF Exception "Message security verification failed" only with header!

Posted By:      Posted Date: September 18, 2010    Points: 0   Category :WCF
Hi, I've got a WCF service doing Username authentication. I authenticate with AD and authorize using AzMan on AD. I'm hosting the service in IIS 6 and its running in an app pool that runs in a domain account that has read rights on the AD. I have a custom header that goes both ways. Everything works well until I assign the custom header to return. If I never assign the custom header to return everything is ok but if I do assign the custom header to return I get the error:- Message security verification failed.Duplicate attribute found. Both 'u:Id' and 'u:Id' are from the namespace 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd'. Line 1, position 520. I've got service level message tracing and I can see the secure conversation stuff happening and the messages going across the interface.   If anyone has any ideas I'd be most appreciative.   Thanks,   Andy

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