You can configure IIS to authenticate, or determine a user's Windows user account identity, before allowing that user to establish a network connection with your server. However, user authentication occurs only when anonymous access is disabled, or when NTFS permissions require users to identify themselves with a valid Windows user account user name and password.
With the authentication options offered by IIS, you can choose an authentication method that meets both your security requirements and the capabilities of your user's Web browser.
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