On 2006-02-03, Oliver Bandel wrote:
> ssh_exchange_identification: Connection closed by remote host
[...]
> When will this error message be printed?

The most common cause of this is when sshd drops a connection because it
is denied by tcpwrappers (/etc/hosts.allow and /etc/hosts.deny).

Another possible cause is that the server does not have enough resources
to handle the new connection (eg it hits a limit of number of processes
or some other resource limit).

--
Darren Tucker (dtucker at zip.com.au)
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Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.