Iis 7.5 Dns Windows Authentication Page User Identity Not Working?

Feb 7, 2011

In IIS 7.5 server I have a website apps.mydomain.com. Site binding for this website is:

IP: All Unassigned

Port: 80

Host name: apps.mydomain.com

In DNS there is an ip address pointing to apps.mydomain.com. Site comes up fine when browsing to this hostname.

I want to get current windows logged in username from asp.net web apps. I enabled windows authentication and disabled anonymous. Using this ASP.Net code to test:

Response.Write(Page.User.Identity.Name);

However, browsing to http://apps.mydomain.com/site/ the application pool identity shows as the Page.User.Identity.Name value and not the current windows logged in username.

If I browse to http://servername/site/ then Page.User.Identity.Name will return current windows logged in username.

Is there something else I need to configure to get the current windows logged in username when using host header?

web.config:
<?xml version="1.0"?>
<configuration>
<system.web>
<authentication mode="Windows"/>
</system.web>
</configuration>

App pool config (left out "handlers" for brevity, there's a 30000 char limit):

[Code]....

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