Normally when setting up IIS 7, I'm used to allowing permissions to user IIS APPPOOL\{application pool name} on the root folder of my web application(s). I also give permissions to IUSR (or the IIS_IUSRS user group. (Note, in Windows Server 2008, I found that IUSR isn't in that group by default, so I added it).

In Windows Server 2008, I cannot find user IIS APPPOOL\{application pool name} under Security under the Windows Folder Properties. I'm using Windows Authentication in ASP.NET. I'm receiving a 401.1 on the page in Internet Explorer 8 after getting the authentication prompt. Mozilla Firefox also gave me a Windows authentication prompt, and got me into the site fine. Same with Google Chrome.

How can I solve this one?

HTTP Error 401.1 - Unauthorized You do not have permission to view this directory or page using the credentials that you supplied.

Specific page information:

Module: WindowsAuthenticationModule 
Notification: AuthenticateRequest 
Handler: PageHandlerFactory-ISAPI-4.0_32bit 
Error Code: 0x8009030e 
Requested URL: http://.....aspx 
Physical Path: C:\.........aspx 
Logon Method: Not yet determined 
Logon User: Not yet determined