I got a error messages from /var/log/auth.log which is about sshd......
.....sshd : reverse mapping checking getaddrinfo for core-01.148.rdcw.com
failed - POSSIBLE BREAKIN ATTEMPT !
all my sshd_config is default setting except I have change to
"PasswordAuthentication NO , PermitEmptyPasswords NO , and
ChallengeResponseAuthentication NO"
Is that I am being hack ?
last command show who is login before but it seem ok....
What should I do ?
Thanks !
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