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看起来服务器受到攻击. /var/log/auth.log的内容如下.它试图用所有这些用户名ssh,我怎么能把它关闭.服务器是Ubuntu.

Feb 22 16:29:15 server sshd[23413]: Failed password for invalid user mirror from 220.132.192.220 port 43881 ssh2

Feb 22 16:29:15 server sshd[23414]: Failed password for invalid user justice from 220.132.192.220 port 43882 ssh2

Feb 22 16:29:15 server sshd[23416]: Failed password for invalid user london from 220.132.192.220 port 43885 ssh2

Feb 22 16:29:15 server sshd[23415]: Failed password for invalid user justice from 220.132.192.220 port 43884 ssh2

Feb 22 16:29:17 server sshd[23421]: Invalid user oxford from 203.66.115.43

Feb 22 16:29:17 server sshd[23421]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:17 server sshd[23421]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.66.115.43

Feb 22 16:29:17 server sshd[23422]: Invalid user london from 203.66.115.43

Feb 22 16:29:17 server sshd[23422]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:17 server sshd[23422]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.66.115.43

Feb 22 16:29:17 server sshd[23424]: Invalid user london from 203.66.115.43

Feb 22 16:29:17 server sshd[23424]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:17 server sshd[23424]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.66.115.43

Feb 22 16:29:17 server sshd[23423]: Invalid user mirror from 203.66.115.43

Feb 22 16:29:17 server sshd[23423]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:17 server sshd[23423]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=203.66.115.43

Feb 22 16:29:19 server sshd[23421]: Failed password for invalid user oxford from 203.66.115.43 port 43959 ssh2

Feb 22 16:29:19 server sshd[23422]: Failed password for invalid user london from 203.66.115.43 port 43962 ssh2

Feb 22 16:29:19 server sshd[23424]: Failed password for invalid user london from 203.66.115.43 port 43967 ssh2

Feb 22 16:29:19 server sshd[23423]: Failed password for invalid user mirror from 203.66.115.43 port 43964 ssh2

Feb 22 16:29:20 server sshd[23429]: Invalid user pacific from 220.132.192.220

Feb 22 16:29:20 server sshd[23429]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:21 server sshd[23429]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.220

Feb 22 16:29:21 server sshd[23430]: Invalid user mirror from 220.132.192.220

Feb 22 16:29:21 server sshd[23430]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:21 server sshd[23430]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.220

Feb 22 16:29:21 server sshd[23432]: Invalid user oxford from 220.132.192.220

Feb 22 16:29:21 server sshd[23431]: Invalid user mirror from 220.132.192.220

Feb 22 16:29:21 server sshd[23432]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:21 server sshd[23432]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.220

Feb 22 16:29:21 server sshd[23431]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:21 server sshd[23431]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.220

Feb 22 16:29:22 server sshd[23429]: Failed password for invalid user pacific from 220.132.192.220 port 44073 ssh2

Feb 22 16:29:22 server sshd[23430]: Failed password for invalid user mirror from 220.132.192.220 port 44078 ssh2

Feb 22 16:29:23 server sshd[23432]: Failed password for invalid user oxford from 220.132.192.220 port 44082 ssh2

Feb 22 16:29:23 server sshd[23431]: Failed password for invalid user mirror from 220.132.192.220 port 44079 ssh2

Feb 22 16:29:24 server sshd[23437]: Invalid user pizza from 202.39.75.16

Feb 22 16:29:24 server sshd[23437]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:24 server sshd[23437]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.39.75.16

Feb 22 16:29:24 server sshd[23438]: Invalid user oxford from 202.39.75.16

Feb 22 16:29:24 server sshd[23438]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:24 server sshd[23438]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.39.75.16

Feb 22 16:29:24 server sshd[23441]: Invalid user oxford from 202.39.75.16

Feb 22 16:29:24 server sshd[23441]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:24 server sshd[23441]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.39.75.16

Feb 22 16:29:24 server sshd[23440]: Invalid user pacific from 202.39.75.16

Feb 22 16:29:24 server sshd[23440]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:24 server sshd[23440]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.39.75.16

Feb 22 16:29:26 server sshd[23437]: Failed password for invalid user pizza from 202.39.75.16 port 44173 ssh2

Feb 22 16:29:27 server sshd[23438]: Failed password for invalid user oxford from 202.39.75.16 port 44184 ssh2

Feb 22 16:29:27 server sshd[23441]: Failed password for invalid user oxford from 202.39.75.16 port 44186 ssh2

Feb 22 16:29:27 server sshd[23440]: Failed password for invalid user pacific from 202.39.75.16 port 44185 ssh2

Feb 22 16:29:28 server sshd[23445]: Invalid user quality from 220.132.192.198

Feb 22 16:29:28 server sshd[23445]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:28 server sshd[23445]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.198

Feb 22 16:29:29 server sshd[23446]: Invalid user pacific from 220.132.192.198

Feb 22 16:29:29 server sshd[23446]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:29 server sshd[23446]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.198

Feb 22 16:29:29 server sshd[23448]: Invalid user pacific from 220.132.192.198

Feb 22 16:29:29 server sshd[23448]: pam_unix(sshd:auth): check pass; user unknown

Feb 22 16:29:29 server sshd[23448]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=220.132.192.198

Feb 22 16:29:29 server sshd[23450]: Invalid user pizza from 220.132.192.198

Feb 22 16:29:29 server sshd[23450]: pam_unix(sshd:auth): check pass; user unknown

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