Get the logged in user in windows on the client

Hello everyone.
I wonder how do I get the user logged on the client windows before authenticate via WINDOWS need before making some validations for only then authenticate.
I have a asp.net mvc project 4 and yet I used the following tips:
Request.ServerVariables ["LOGON_USER"] - takes the user logged on my system (not used)
System.Web.HttpContext.Current.Request.LogonUserIdentity.Name - takes the user of the machine with domain, but after publishing the site in IIS redbourn the field and IIS User (not used)
The need is in the production environment the user that should be noted is the client rather than the server.
Sorry for my bad English!
Thank U.