From owner-freebsd-questions@FreeBSD.ORG  Thu Oct 20 12:26:59 2005
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Date: Thu, 20 Oct 2005 08:26:54 -0400
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	<200510191000.13507.dawnshade@mail.ru>
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Subject: Re: possible breakin attempt?
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dawnshade wrote:

>On Tuesday 18 October 2005 21:19, Anthony Philipp wrote:
>  
>
>see man ssd_config for directive UseDNS or just block tcp/22 from not trusted 
>hosts.
>  
>
Another helpfull thing to do is to limit what users can connect through 
SSH using the AllowUsers directive.
In your /etc/sshd_config you put a line like

AllowUsers <user1> <user2> <user3>

You will need to restart sshd after making the change.