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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