07.01.2011 00:28, Timothy Murphy:

> I have an sshd server running on a machine in Ireland.
> 
> Can I configure it so that it only accepts connection
> from certain machines, wherever they may be in the world?

Among other things already mentioned you could turn off all
*Authentication options in sshd_config and append a Match block matching
addresses or host names where you turn the relevant ones back on. For
example, something like

[...]
PasswordAuthentication no
PubkeyAuthentication no
[...]
Match Address x.y.z.w
PubkeyAuthentication yes

-- 
Regards
  mks
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