D-Link NetDefendOS User Manual page 632

Interface by going to Status > Run-time Information > User Authentication Status.
• Log Event Messages
NetDefendOS generates a log event messages whenever the brute force protection
mechananism places a username on the block list. The following is a typical message:
SYSTEM prio=Notice id=03200802 rev=1
event=user_blocked database=AdminUsers username=admin
blockedremaining=10s blockedsince="2016-06-10 09:42:12"
Multi Factor Authentication Provides Additional Security
Another approach which can neutralize brute force attacks is to use multi factor authentication,
where an additional code needs to be entered in addition to standard credentials. This is
described further in Section 8.7, "Multi Factor Authentication".
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Chapter 8: User Authentication