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I have a client that makes a call to a WCF service. When I make the first call to the service, there are 2 extra calls (visible via Fiddler).
The action of the first one is s:mustUnderstand
The second call is:
Can someone explain to me why the extra calls are being made? How to get rid of them, if possible?
Just for reference, the data being transported is serialized with Protocol Buffers library by Marc Gravell.
The extra calls are used to set up secure communications and the security context. Read this link: http://blog.facilelogin.com/2008/11/secure-conversation-with-wcf.html