Dec 16 22:34:13 web8 sshd\[28946\]: Invalid user guns from 199.116.112.245
Dec 16 22:34:13 web8 sshd\[28946\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=199.116.112.245
Dec 16 22:34:15 web8 sshd\[28946\]: Failed password for invalid user guns from 199.116.112.245 port 45345 ssh2
Dec 16 22:41:03 web8 sshd\[32230\]: Invalid user torsvik from 199.116.112.245
Dec 16 22:41:03 web8 sshd\[32230\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=199.116.112.245

Dec 16 22:47:25 microserver sshd[22871]: Invalid user polycom from 191.189.30.241 port 49154
Dec 16 22:47:25 microserver sshd[22871]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=191.189.30.241
Dec 16 22:47:27 microserver sshd[22871]: Failed password for invalid user polycom from 191.189.30.241 port 49154 ssh2
Dec 16 22:56:14 microserver sshd[24309]: Invalid user debasish from 191.189.30.241 port 52736
Dec 16 22:56:14 microserver sshd[24309]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=191.189.30.241
Dec 16 23:14:19 microserver sshd[26918]: Invalid user dorai from 191.189.30.241 port 59829
Dec 16 23:14:19 microserver sshd[26918]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=191.189.30.241
Dec 16 23:14:21 microserver sshd[26918]: Failed password for invalid user dorai from 191.189.30.241 port 59829 ssh2
Dec 16 23:22:52 microserver sshd[28380]: Invalid user mccalla from 191.189.30.24

Dec 16 17:34:44 plusreed sshd[10116]: Invalid user wikberg from 106.13.110.74
...

2019-12-16T22:59:17.615650centos sshd\[13940\]: Invalid user eminem from 154.8.185.122 port 36486
2019-12-16T22:59:17.624172centos sshd\[13940\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=154.8.185.122
2019-12-16T22:59:20.032266centos sshd\[13940\]: Failed password for invalid user eminem from 154.8.185.122 port 36486 ssh2

Dec 17 00:00:44 ArkNodeAT sshd\[6123\]: Invalid user 123ws from 40.73.73.130
Dec 17 00:00:44 ArkNodeAT sshd\[6123\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=40.73.73.130
Dec 17 00:00:46 ArkNodeAT sshd\[6123\]: Failed password for invalid user 123ws from 40.73.73.130 port 45256 ssh2

Dec 16 23:25:37 ns381471 sshd[15493]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=85.95.191.56
Dec 16 23:25:38 ns381471 sshd[15493]: Failed password for invalid user sandstad from 85.95.191.56 port 42750 ssh2

Dec 16 23:21:45 mail sshd[8578]: Failed password for root from 49.234.43.173 port 38962 ssh2
Dec 16 23:27:48 mail sshd[10196]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.234.43.173 
Dec 16 23:27:50 mail sshd[10196]: Failed password for invalid user basri from 49.234.43.173 port 40148 ssh2

Dec 16 23:51:40 ns381471 sshd[16735]: Failed password for root from 124.30.44.214 port 19166 ssh2

Dec 16 22:51:53 tux-35-217 sshd\[12262\]: Invalid user ching from 186.10.17.84 port 41694
Dec 16 22:51:53 tux-35-217 sshd\[12262\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=186.10.17.84
Dec 16 22:51:55 tux-35-217 sshd\[12262\]: Failed password for invalid user ching from 186.10.17.84 port 41694 ssh2
Dec 16 22:59:32 tux-35-217 sshd\[12358\]: Invalid user Kalle from 186.10.17.84 port 49028
Dec 16 22:59:32 tux-35-217 sshd\[12358\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=186.10.17.84
...

Dec 16 12:32:27 web1 sshd\[18041\]: Invalid user test from 157.230.109.166
Dec 16 12:32:27 web1 sshd\[18041\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=157.230.109.166
Dec 16 12:32:29 web1 sshd\[18041\]: Failed password for invalid user test from 157.230.109.166 port 49338 ssh2
Dec 16 12:37:11 web1 sshd\[18536\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=157.230.109.166  user=root
Dec 16 12:37:13 web1 sshd\[18536\]: Failed password for root from 157.230.109.166 port 55096 ssh2

Dec 16 23:13:55 ns3042688 sshd\[10592\]: Failed password for root from 62.210.245.227 port 44596 ssh2
Dec 16 23:18:49 ns3042688 sshd\[12122\]: Invalid user min from 62.210.245.227
Dec 16 23:18:51 ns3042688 sshd\[12122\]: Failed password for invalid user min from 62.210.245.227 port 52404 ssh2
Dec 16 23:23:41 ns3042688 sshd\[13543\]: Invalid user liendo from 62.210.245.227
Dec 16 23:23:43 ns3042688 sshd\[13543\]: Failed password for invalid user liendo from 62.210.245.227 port 60240 ssh2
...

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These guys are email spamers.

SSH authentication failure x 6 reported by Fail2Ban
...

Dec 16 23:30:55 ns381471 sshd[15739]: Failed password for root from 118.24.82.81 port 46935 ssh2

Dec 16 17:34:14 mail sshd\[36945\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=45.67.14.179  user=root
...