Brute-force and IIS/w2k logs

["Cushmeer, Barnar" <BarnarCushmeer () Enthusian com>]

        Hello,

        I've just reviewed a short range of security logs on a W2k/IIS box
and there is an over abundance of repeated invalid login attempts.  The
attempts seem to focus on weak user ids (ie; admin, administrator, root,
sql, etc.).  However I've seen a few successful "anonymous" login/logouts.

        My two questions are.. is the "anonymous" login something to be
concerned about and what's the best way(s) to gather more relevant log data
about the source of the attacks beyond the scant information provided in the
Security log (machine name, time/date).  Is there a way to capture the IP
address of the source?

        Thank you.
        -BC


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