我有个问题。
有人试图进入我的服务器，而且这种情况经常发生。例如：
Aug 19 14:11:42 oplot sshd[18373]: input_userauth_request: invalid user oracle
Aug 19 14:11:42 oplot sshd[18372]: pam_unix(sshd:auth): check pass; user unknown
Aug 19 14:11:42 oplot sshd[18372]: pam_unix(sshd:auth): authentication failure;
logname= uid=0 euid=0 tty=ssh ruser= rhost=211.38.137.44
Aug 19 14:11:44 oplot sshd[18372]: Failed password for invalid user oracle from
211.38.137.44 port 36 841 ssh2
Aug 19 14:11:45 oplot sshd[18373]: Received disconnect from 211.38.137.44: 11:
Bye Bye
Aug 19 14:11:47 oplot sshd[18374]: Invalid user test from 211.38.137.44
Aug 19 14:11:47 oplot sshd[18375]: input_userauth_request: …