If you want to use Windows Authentication in your ASP .NET website, you need to add the <authentication mode="Windows"/> tag in the Web.config.

<system.web>
    <authentication mode="Windows"/>

If the HttpContext.Current.user.Identity.Name is still empty. Check the authentication feature of the web application in IIS, make sure all authentication mechanisms are Disabled, except for the Windows Authentication, this should be set to Enabled.

 

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