Feb 15 14:37:01 vps1 sshd[17428]: User root from 211.141.237.36 not allowed because not listed in AllowUsers
Feb 15 14:37:01 vps1 sshd[17429]: input_userauth_request: invalid user root
Feb 15 14:37:02 vps1 sshd[17429]: Received disconnect from 211.141.237.36: 11: Bye Bye
The above IP tried probably about 100 times. For info, the above log is from CentOS 5.4.