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The HTTP request is unauthorized with client authentication scheme 'Anonymous'. The authentication header received from the server was 'Negotiate,NTLM

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Hi people,

I have a Silverlight app which the Web Service is in the same solution.  I have a web.config for Windows authentication and the App.Web is configured as follow :

Anonymous Authentication : Disabled
SSL Enabled : true
Windows Authentication : Enabled

I was working as normal, everything was absolutely fine then I added an [OperationContract] absolutely as normal like the others, and do the usual action I always did which is compile the App.Web and then go in the client to Update the service reference and here's what I got :

The HTTP request is unauthorized with client authentication scheme 'Anonymous'. The authentication header received from the server was 'Negotiate,NTLM

Now I hosnestly don't know what to do.  I've read a lot on the web about configuration but since nothing changed at all not a single character I'm completely lost.  Any ideas where I should look at to solve this issue ?

I repeat to make sure it's clear,  absolutely nothing changed nor in VS 2012 nor in IIS EXPRESS configuration nor in my Web.Config
I really need help on this as I'm unable to update my Service Reference on the client side


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