做个服务器，总是有莫名其妙的的人在扫描你的漏洞，其中SSH端口暴力破解就是其中一个，例如登录SSH的时候，提示登录失败次数：
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Last failed login: Tue May 4 13:13:15 CST 2021 from 171.254.11.237 on ssh:notty There were 24688 failed login attempts since the last successful login. Last login: Sat Jan 9 16:25:33 2021 from 8.8.8.8 |