Error added: 2005-08-11T09:39:23Z
Someone has tried to log in as guest, but is not allowed as the shell specified in /etc/passwd is /dev/null, and this is not executable. It is likely a script, trying to break into boxes.
Also note that it got the right password for guest.
USe the AllowUsers or AllowGroups Directive in sshd_conf to only allow the specified users to log in via ssh. This will prevent the abuse of default system accounts which DO HAVE shell access. - There are plenty of them.
for answer #2, not necessarily, I got the same message, even I do not allow password authentication. just certificates.
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