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From: Mattias Pantzare <pantzer@ludd.luth.se>
To: Koay Hock Chuan <akmal@tm.net.my>
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Security.
In-Reply-To: <32EB7F28.6BB8@tm.net.my>
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> 1.] How do I disable the TELNET and FTP function from the rest of
> the     users, allowing only 1 administration station to be able to do
> that?
> 
> 2.] How do I display a certain messages on the user screen the
> moment     they try to TELNET to my FreeBSD DNS server. That means,
> instead of     waiting for timeout, maybe there is a way I can display a
> message to     them, giving them certain messages discouraging them from
> TELNETing     to this server.

Both can be solved by installing tcp_wrapper.
(/usr/ports/security/tcp_wrapper)