SSH brute-force: detected 38 distinct usernames within a 24-hour window.

Feb 27 00:05:13 dillonfme sshd\[29048\]: Invalid user nw from 129.204.29.45 port 53996
Feb 27 00:05:13 dillonfme sshd\[29048\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.29.45
Feb 27 00:05:15 dillonfme sshd\[29048\]: Failed password for invalid user nw from 129.204.29.45 port 53996 ssh2
Feb 27 00:11:21 dillonfme sshd\[29306\]: User backup from 129.204.29.45 not allowed because not listed in AllowUsers
Feb 27 00:11:21 dillonfme sshd\[29306\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.29.45  user=backup
...

Sep 19 02:27:16 yesfletchmain sshd\[19242\]: User root from 129.204.194.249 not allowed because not listed in AllowUsers
Sep 19 02:27:16 yesfletchmain sshd\[19242\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.194.249  user=root
Sep 19 02:27:18 yesfletchmain sshd\[19242\]: Failed password for invalid user root from 129.204.194.249 port 49440 ssh2
Sep 19 02:32:49 yesfletchmain sshd\[19553\]: Invalid user lie from 129.204.194.249 port 35894
Sep 19 02:32:49 yesfletchmain sshd\[19553\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.194.249
...

Dec 23 14:55:19 flomail dovecot: imap-login: Disconnected (auth failed, 1 attempts in 6 secs): user=, method=PLAIN, rip=14.161.46.114, lip=10.140.194.78, TLS: Disconnected, session=

Unauthorized connection attempt detected from IP address 196.189.57.241 to port 445

Unauthorized connection attempt detected from IP address 168.228.51.155 to port 445

Dec 23 20:16:23 v22018086721571380 sshd[29786]: Failed password for invalid user test from 119.10.114.5 port 44903 ssh2
Dec 23 20:21:28 v22018086721571380 sshd[29944]: Failed password for invalid user lambright from 119.10.114.5 port 12092 ssh2

Jul 19 03:59:29 yesfletchmain sshd\[4477\]: Invalid user toor from 129.204.254.4 port 41078
Jul 19 03:59:29 yesfletchmain sshd\[4477\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.254.4
Jul 19 03:59:31 yesfletchmain sshd\[4477\]: Failed password for invalid user toor from 129.204.254.4 port 41078 ssh2
Jul 19 04:05:02 yesfletchmain sshd\[4545\]: Invalid user deploy from 129.204.254.4 port 37368
Jul 19 04:05:02 yesfletchmain sshd\[4545\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.254.4
...

Invalid user akey from 129.204.2.182 port 57760

Dec 23 09:23:27 php1 sshd\[18888\]: Invalid user saligrama from 212.64.127.106
Dec 23 09:23:27 php1 sshd\[18888\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.64.127.106
Dec 23 09:23:28 php1 sshd\[18888\]: Failed password for invalid user saligrama from 212.64.127.106 port 42810 ssh2
Dec 23 09:29:19 php1 sshd\[19443\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.64.127.106  user=root
Dec 23 09:29:21 php1 sshd\[19443\]: Failed password for root from 212.64.127.106 port 40921 ssh2

Too many connections or unauthorized access detected from Arctic banned ip

SSH authentication failure x 6 reported by Fail2Ban
...

MultiHost/MultiPort Probe, Scan, Hack -

May 22 17:59:14 yesfletchmain sshd\[24288\]: Invalid user ux from 129.204.3.8 port 33786
May 22 17:59:14 yesfletchmain sshd\[24288\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.3.8
May 22 17:59:16 yesfletchmain sshd\[24288\]: Failed password for invalid user ux from 129.204.3.8 port 33786 ssh2
May 22 18:04:38 yesfletchmain sshd\[24393\]: Invalid user sun from 129.204.3.8 port 45772
May 22 18:04:38 yesfletchmain sshd\[24393\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.204.3.8
...

fail2ban honeypot