web.config and HTTP code 401

[jnf]

Hi, all,

I have an ASP.NET config. as [Integrated Windows
authentication].In web.config, <authentication
mode="Windows" /> <authorization> <deny Users="?" />
</authorization>. In physical location, allow
IUSR_machinename/users/admin to access web appli.

Now, I found the weblog trap 401/302/500..all kinds HTTP
return codes after each web pages. But from IE browser,
it feels nothing.

The web environment:
1. Windows2003, IIS6.0, MSSQL 2000, VS.NET 2003.
2. Windows XP, IIS5.0, MSSQL 2000, VS.NET 2003.
Both has same behavior.

Web log doesn't see HTTP return code if I setup
Authentication Methods as [Enable Anonymous access].

Anyone can help? Please.. and Thanks.

Jnf