From owner-freebsd-questions@FreeBSD.ORG  Tue Feb  5 00:17:54 2008
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From: Chuck Swiger <cswiger@mac.com>
To: Tuan Ho <taho89@hotmail.com>
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Date: Mon, 4 Feb 2008 16:17:53 -0800
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Cc: freebsd-questions@freebsd.org
Subject: Re: Help on freeBSD 4.10
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On Feb 4, 2008, at 2:31 PM, Tuan Ho wrote:
> 1/
> As an administrator, how can i disable an account after three  
> consecutive unsuccessful login attempts?

As root, you could run:

  chsh -s /usr/sbin/nologin _user_

> 2/
> How can I enable logged file to monitor successful and unsuccessful  
> logins and logouts?

This should be enabled by default already; examine /var/log/auth.log....

-- 
-Chuck