messages에 다음과 같은 로그가 있는데요??
 Feb  8 00:41:50 adsl sshd[28327]: scanned from 61.74.214.12 with SSH-1.0-SSH_Version_Mapper.  Don't panic.
Feb  8 00:41:50 adsl sshd[28326]: Did not receive identification string from 61.74.214.12
 참고로 마이컴의 ssh version은
openssh-askpass-3.0.2p1-1
openssh-server-3.0.2p1-1
openssh-3.0.2p1-1
openssh-askpass-gnome-3.0.2p1-1
openssh-clients-3.0.2p1-1