wcf - HttpContext.Current.User is always null -

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i have wcf service has method return windows username of silverlight client consuming service . wcf service using basichttpbinding transportcredentialonly mode set , transportclientcredentialtype set windows. in iis windows authentication enabled , anon authentication disabled.

despite (apparently) configuring service correctly when call service , ask return username errors. closer examination shows httpcontext.current.user null (so nullreferenceexception thrown).

does have other ideas why not working?

try adding - 

<servicehostingenvironment aspnetcompatibilityenabled="true" />

to config file


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