Get current logged in user IIS returning DefaultAppPool

Question

I have an asp.net application on my server that uses WindowsAuthentication to log in. The scenario is simple: users logged in, will use the same credentials to login the application.

Certainly, on IISExpress on my machine works great, but when I try to login the application on server, the current user returned is DefaultAppPool .

I guess it's a missing impersonate config on IIS. I tried to get the current user with:

string username = HttpContext.Current.Request.LogonUserIdentity.Name;
string username = WindowsIdentity.GetCurrent().Name;

... and all of above returns the current user loggedin but only works on IISExpress, but not on server IIS.

IIS Express config
DefaultAppPool
- Framework Version 4.0
- Application Pool Identity

Application Authentication Config

Server Info
Windows 2008 R2 Enterprise
IIS 7.5

PD: Is not my best English

Answer 1

I had a similar issues; as far as I can tell it is because the web.config file needs to have the following entries:

<authentication mode="Windows" />
    <identity impersonate="true" />

Also in your IIS/Authentication section in Internet Information Services (IIS) Manager, make sure only Anonymous Authentication and Windows Authentication is Enabled. I had ASP.NET Impersonation checked by mistake and it was giving me the same error you described in this post. Once I disabled that (along with the other modifications), it seems to be working fine.