auth.log

Mar 27 10:29:09 li195-46 sshd[11343]: Invalid user gamma from 221.12.162.169
Mar 27 10:29:09 li195-46 sshd[11343]: pam_unix(sshd:auth): check pass; user unknown
Mar 27 10:29:09 li195-46 sshd[11343]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=221.12.162.169
Mar 27 10:29:11 li195-46 sshd[11343]: Failed password for invalid user gamma from 221.12.162.169 port 55656 ssh2
Mar 27 10:29:21 li195-46 sshd[11345]: Did not receive identification string from 221.12.162.169