Fix "too many authentication failures"

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http://serverfault.com – I have a user account on a machine where they attempted to log in with the incorrect password via SSH until it triggered "too many authentication failures for X" -- I have access ot the box as the root user, but how do i reset this user accounts login? I've tried: faillog -u username -r but this does not seem to resolve the problem for that user account (HowTos)