On a specific directory on IIS, in the Directory Security tab, under Anonymous Access and Authentication Control, I have unchecked Allow Anonymous Access.

Now, when I access that directory from Netscape, it prompts me to enter a username and password.

I tried with the administrator account and it works fine. However, if I try with any other accounts, it won't allow me to get access.

To simplify the process, I have given administrator priviledge to the account I was trying to login with. I have also went into the Explorer directory permissions and added that account to the list with Full Control. However, that account can't still do the login.