Forgot to add in case you wonder, I understand the IWAM_{machineOrHostName} NT user account is required to be enabled to start the IIS server, it's related but that relevant to the problem at hand.

> A client informed me that his site (on NT class OS and IIS web server)
> now required Network password to logon.
> I suspected it's NT Challenge/Response and IIS Security problem with
> his new setup.
>
> Did quick research to confirm my suspicion, seems that my suspicion is
> valid, it seems at least two situations would result in the
> above-mentioned problem:
> 1) Anonymous Access with an NT/its class OS IIS user account,
> IUSR_{machineOrHostName} has been disabled under Integrated Windows
> Authentication schema (haven't tested other two authen. schemas).
> 2) The default IIS user account, IUSER_{machineOrHostName) has been
> disabled.
>
> I've tested the above two scenarios separately with same result, that
> is, NT logon is prompted when accessing a site.
>
> Is there/ are there any further scenarios that cause the same NT
> access problem?  Security gurus, you'll make my days.
>
> TIA.
>
>
>
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