Configuring Digest Authentication in IIS 6.0 (IIS 6.0)
Configuring Digest authentication on the server running IIS requires the following two tasks:
You must be a member of the Administrators group on the local computer to perform the following procedure or procedures. As a security best practice, log on to your computer by using an account that is not in the Administrators group, and then use the runas command to run IIS Manager as an administrator. At a command prompt, type runas /user:Administrative_AccountName "mmc %systemroot%\system32\inetsrv\iis.msc".
To enable Digest authentication for Windows domain servers and configure the realm name
Configuration settings made at the Web Sites folder level can be inherited by all Web sites.
If Basic authentication is enabled for the site, virtual directory, or folder you are configuring, the Default domain box will also be available. However, only Realm is meaningful to Digest authentication.