Request.servervariables("AUTH_USER") is blank from Classic ASP code

Hi Team,

Our application is in classic ASP and we have the code as Request.servervariable("AUTH_USER") to get the authenticated user details. In IIS 8.5. we have Anonymous authnetication and windows authentication enabled.

Still we are not getting the Server variable values. Could you please check and let us know.

We really need help on this. 

Thanks.