Is sshd installed and running?
Also it could be in your syslog log, but looks like that was recently rotated so it will probably be in syslog.0 although what you could do to see whats happening in real time is do a tail -f /var/log/syslog and attempt to log in. Also if sshd is running you should be able to go into /etc/sshd/sshd_config and set the LogLevel and SysLogFacility.
You will also have your syslog configuration which controls this.
So for my /etc/syslog.conf I have:
And in my /etc/sshd/ssdh_config I have:
LogLevel Info is commented out but in your case since you are debugging set it to be on by uncommenting it. This will tell the system to log all messages from level of info on up to emergency and log them as authpriv which your syslog.conf has set to log to /var/log/secure.