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  3. 我应该升级Freenas安全吗？
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我应该升级Freenas安全吗？

我已经有一个freenas服务器将近一年了，这是我第三次收到一封安全电子邮件，其中有一个sshlogin失败的尝试，而这个尝试不是来自我或任何我认识的人。 

freenas.local login failures: May 3 00:00:38 freenas sshd[40708]: Invalid user postgres from 222.138.139.252 May 3 00:00:38 freenas sshd[40708]: input_userauth_request: invalid user postgres [preauth] May 3 00:00:38 freenas sshd[40708]: Failed password for invalid user postgres from 222.138.139.252 port 9224 ssh2 May 3 00:13:20 freenas sshd[40981]: Invalid user zabbix from 154.66.147.4 May 3 00:13:20 freenas sshd[40981]: input_userauth_request: invalid user zabbix [preauth] May 3 00:13:20 freenas sshd[40981]: Failed password for invalid user zabbix from 154.66.147.4 port 58938 ssh2 May 3 00:21:41 freenas sshd[41198]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 00:43:53 freenas sshd[41773]: Invalid user admin from 222.138.139.252 May 3 00:43:53 freenas sshd[41773]: input_userauth_request: invalid user admin [preauth] May 3 00:43:53 freenas sshd[41773]: Failed password for invalid user admin from 222.138.139.252 port 9224 ssh2 May 3 00:43:54 freenas sshd[41773]: Failed password for invalid user admin from 222.138.139.252 port 9224 ssh2 May 3 01:05:44 freenas sshd[42330]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 01:26:47 freenas sshd[42820]: Invalid user guest from 222.138.139.252 May 3 01:26:47 freenas sshd[42820]: input_userauth_request: invalid user guest [preauth] May 3 01:26:47 freenas sshd[42820]: Failed password for invalid user guest from 222.138.139.252 port 9224 ssh2 May 3 01:47:48 freenas sshd[43330]: Invalid user test from 222.138.139.252 May 3 01:47:48 freenas sshd[43330]: input_userauth_request: invalid user test [preauth] May 3 01:47:48 freenas sshd[43330]: Failed password for invalid user test from 222.138.139.252 port 9224 ssh2 May 3 01:53:07 freenas sshd[43460]: Invalid user guest from 31.184.198.95 May 3 01:53:07 freenas sshd[43460]: input_userauth_request: invalid user guest [preauth] May 3 01:53:07 freenas sshd[43460]: Failed password for invalid user guest from 31.184.198.95 port 51000 ssh2 May 3 01:54:03 freenas sshd[43497]: Invalid user guest from 31.184.198.95 May 3 01:54:03 freenas sshd[43497]: input_userauth_request: invalid user guest [preauth] May 3 01:54:03 freenas sshd[43497]: Failed password for invalid user guest from 31.184.198.95 port 41555 ssh2 May 3 01:54:04 freenas sshd[43499]: Invalid user guest from 31.184.198.95 May 3 01:54:04 freenas sshd[43499]: input_userauth_request: invalid user guest [preauth] May 3 01:54:04 freenas sshd[43499]: Failed password for invalid user guest from 31.184.198.95 port 41915 ssh2 May 3 02:08:41 freenas sshd[43880]: Invalid user info from 222.138.139.252 May 3 02:08:41 freenas sshd[43880]: input_userauth_request: invalid user info [preauth] May 3 02:08:41 freenas sshd[43880]: Failed password for invalid user info from 222.138.139.252 port 9224 ssh2 May 3 02:12:58 freenas sshd[43989]: Invalid user admin from 31.184.198.95 May 3 02:12:58 freenas sshd[43989]: input_userauth_request: invalid user admin [preauth] May 3 02:12:58 freenas sshd[43989]: Failed password for invalid user admin from 31.184.198.95 port 50234 ssh2 May 3 02:30:36 freenas sshd[44406]: Invalid user ubnt from 222.138.139.252 May 3 02:30:36 freenas sshd[44406]: input_userauth_request: invalid user ubnt [preauth] May 3 02:30:36 freenas sshd[44406]: Failed password for invalid user ubnt from 222.138.139.252 port 9224 ssh2 May 3 02:30:43 freenas sshd[44408]: Invalid user admin from 31.184.198.95 May 3 02:30:43 freenas sshd[44408]: input_userauth_request: invalid user admin [preauth] May 3 02:30:43 freenas sshd[44408]: Failed password for invalid user admin from 31.184.198.95 port 38066 ssh2 May 3 02:53:19 freenas sshd[44953]: Invalid user PlcmSpIp from 222.138.139.252 May 3 02:53:19 freenas sshd[44953]: input_userauth_request: invalid user PlcmSpIp [preauth] May 3 02:53:19 freenas sshd[44953]: Failed password for invalid user PlcmSpIp from 222.138.139.252 port 9224 ssh2 May 3 03:18:35 freenas sshd[46224]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 03:18:36 freenas sshd[46224]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 03:18:36 freenas sshd[46224]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 03:23:59 freenas sshd[46343]: Failed password for root from 220.124.151.130 port 53283 ssh2 May 3 03:24:02 freenas sshd[46345]: Failed password for root from 220.124.151.130 port 54390 ssh2 May 3 03:24:04 freenas sshd[46347]: Failed password for root from 220.124.151.130 port 55220 ssh2 May 3 03:24:07 freenas sshd[46349]: Invalid user syslog from 220.124.151.130 May 3 03:24:07 freenas sshd[46349]: input_userauth_request: invalid user syslog [preauth] May 3 03:24:07 freenas sshd[46349]: Failed password for invalid user syslog from 220.124.151.130 port 56104 ssh2 May 3 03:24:09 freenas sshd[46374]: Invalid user syslog from 220.124.151.130 May 3 03:24:09 freenas sshd[46374]: input_userauth_request: invalid user syslog [preauth] May 3 03:24:09 freenas sshd[46374]: Failed password for invalid user syslog from 220.124.151.130 port 57054 ssh2 May 3 03:42:50 freenas sshd[46890]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 03:42:50 freenas sshd[46890]: Failed password for root from 222.138.139.252 port 9224 ssh2 May 3 04:04:26 freenas sshd[47508]: Invalid user ftpuser from 222.138.139.252 May 3 04:04:26 freenas sshd[47508]: input_userauth_request: invalid user ftpuser [preauth] May 3 04:04:26 freenas sshd[47508]: Failed password for invalid user ftpuser from 222.138.139.252 port 9224 ssh2 May 3 04:28:17 freenas sshd[48044]: Invalid user support from 222.138.139.252 May 3 04:28:17 freenas sshd[48044]: input_userauth_request: invalid user support [preauth] May 3 04:28:17 freenas sshd[48044]: Failed password for invalid user support from 222.138.139.252 port 9224 ssh2 May 3 04:51:52 freenas sshd[48631]: Invalid user debian from 222.138.139.252 May 3 04:51:52 freenas sshd[48631]: input_userauth_request: invalid user debian [preauth] May 3 04:51:52 freenas sshd[48631]: Failed password for invalid user debian from 222.138.139.252 port 9224 ssh2 May 3 05:14:51 freenas sshd[49227]: Invalid user ubuntu from 222.138.139.252 May 3 05:14:51 freenas sshd[49227]: input_userauth_request: invalid user ubuntu [preauth] May 3 05:14:51 freenas sshd[49227]: Failed password for invalid user ubuntu from 222.138.139.252 port 9224 ssh2 May 3 05:14:52 freenas sshd[49227]: Failed password for invalid user ubuntu from 222.138.139.252 port 9224 ssh2 May 3 06:26:16 freenas sshd[50976]: Invalid user ubnt from 146.0.79.253 May 3 06:26:16 freenas sshd[50976]: input_userauth_request: invalid user ubnt [preauth] May 3 06:26:16 freenas sshd[50976]: Failed password for invalid user ubnt from 146.0.79.253 port 41046 ssh2 May 3 12:45:27 freenas sshd[17582]: Failed password for root from 176.122.49.3 port 51726 ssh2 May 3 12:45:27 freenas sshd[17584]: Invalid user naseej from 176.122.49.3 May 3 12:45:27 freenas sshd[17584]: input_userauth_request: invalid user naseej [preauth] May 3 12:45:27 freenas sshd[17584]: Failed password for invalid user naseej from 176.122.49.3 port 52087 ssh2 May 3 12:45:29 freenas sshd[17586]: Failed password for root from 176.122.49.3 port 52432 ssh2 May 3 12:45:33 freenas sshd[17588]: Failed password for root from 176.122.49.3 port 53080 ssh2 May 3 12:45:37 freenas sshd[17590]: Invalid user syslog from 176.122.49.3 May 3 12:45:37 freenas sshd[17590]: input_userauth_request: invalid user syslog [preauth] May 3 12:45:37 freenas sshd[17590]: Failed password for invalid user syslog from 176.122.49.3 port 54596 ssh2 May 3 12:45:38 freenas sshd[17592]: Invalid user shadmin from 176.122.49.3 May 3 12:45:38 freenas sshd[17592]: input_userauth_request: invalid user shadmin [preauth] May 3 12:45:38 freenas sshd[17592]: Failed password for invalid user shadmin from 176.122.49.3 port 56197 ssh2 May 3 12:45:39 freenas sshd[17594]: Invalid user icnanker from 176.122.49.3 May 3 12:45:39 freenas sshd[17594]: input_userauth_request: invalid user icnanker [preauth] May 3 12:45:39 freenas sshd[17594]: Failed password for invalid user icnanker from 176.122.49.3 port 56891 ssh2 May 3 12:45:40 freenas sshd[17596]: Failed password for root from 176.122.49.3 port 57199 ssh2 May 3 12:45:40 freenas sshd[17598]: Invalid user nano from 176.122.49.3 May 3 12:45:40 freenas sshd[17598]: input_userauth_request: invalid user nano [preauth] May 3 12:45:40 freenas sshd[17598]: Failed password for invalid user nano from 176.122.49.3 port 57535 ssh2 May 3 12:45:42 freenas sshd[17600]: Failed password for root from 176.122.49.3 port 57814 ssh2 May 3 12:45:46 freenas sshd[17602]: Failed password for root from 176.122.49.3 port 58502 ssh2 May 3 12:45:49 freenas sshd[17604]: Failed password for root from 176.122.49.3 port 59876 ssh2 May 3 12:45:51 freenas sshd[17606]: Invalid user syslog from 176.122.49.3 May 3 12:45:51 freenas sshd[17606]: input_userauth_request: invalid user syslog [preauth] May 3 12:45:51 freenas sshd[17606]: Failed password for invalid user syslog from 176.122.49.3 port 32837 ssh2 May 3 12:45:53 freenas sshd[17608]: Failed password for root from 176.122.49.3 port 33403 ssh2 -- End of security output --

那么，我在哪里或如何看到有人不知道是否能够login我的服务器，如果有，我应该采取什么措施来升级服务器的安全性？