From owner-freebsd-stable@FreeBSD.ORG  Sun Jun 12 01:21:57 2005
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Date: Sun, 12 Jun 2005 10:21:49 +0900 (JST)
From: Tod McQuillin <devin@spamcop.net>
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To: Peter Jeremy <PeterJeremy@optushome.com.au>
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Cc: Jack Raats <jack@raats.xs4all.nl>,
	FreeBSD Stable <freebsd-stable@freebsd.org>, freebsd-questions@freebsd.org
Subject: Re: Strange error
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On Sun, 12 Jun 2005, Peter Jeremy wrote:

> On Fri, 2005-Jun-10 22:41:36 +0200, Jack Raats wrote:
>> This day I've a very strange error when trying to connect to my FreeBSD machine (4.11-STABLE)
>> I got the following error:
>> ssh_exchange_identification: Connection closed by remote host
>>
>> Can anyone give me any clue what's wrong?

I missed the start of this thread but this sounds like tcpwrappers closing 
the connection.

Check your /etc/hosts.allow and look in /var/log/messages for a message 
like:

May 31 12:18:36 hostname sshd[1594]: warning: /etc/hosts.allow, line 32: can't verify hostname: getaddrinfo(1.2.3.4.example.com, AF_INET) failed
May 31 12:18:37 hostname sshd[1594]: refused connect from 1.2.3.4 (1.2.3.4)

If you see something like that you can change the entry in your 
/etc/hosts.allow to allow ssh connections from that specific IP or 
netmask.

see hosts_options(5) for details.
-- 
Tod McQuillin