Mar 20 22:45:23 mail.srvfarm.net postfix/smtpd[2947801]: NOQUEUE: reject: RCPT from unknown[217.112.142.155]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
Mar 20 22:51:52 mail.srvfarm.net postfix/smtpd[2948466]: NOQUEUE: reject: RCPT from unknown[217.112.142.155]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
Mar 20 22:51:52 mail.srvfarm.net postfix/smtpd[2947808]: NOQUEUE: reject: RCPT from unknown[217.112.142.155]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
Mar 20 22:51:57 mail.srvfarm.net postfix/smtpd[2945805]: NOQUEUE: reject: RCPT from unknown[217.112.142.155]: 450 4.1.8 

Mar 21 02:56:44 debian-2gb-nbg1-2 kernel: \[7014904.171615\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=92.118.37.53 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=60656 PROTO=TCP SPT=52444 DPT=55895 WINDOW=1024 RES=0x00 SYN URGP=0

Mar 21 02:43:11 legacy sshd[12566]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.203.115.141
Mar 21 02:43:13 legacy sshd[12566]: Failed password for invalid user senpai from 1.203.115.141 port 56915 ssh2
Mar 21 02:47:27 legacy sshd[12749]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.203.115.141
...

Invalid user vivek from 118.24.101.182 port 47638

SSH brute force attempt

Port scan on 2 port(s): 139 445

" "

Invalid user docker from 172.247.123.207 port 9462

Mar 20 22:17:37 reverseproxy sshd[14261]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=80.211.71.17
Mar 20 22:17:38 reverseproxy sshd[14261]: Failed password for invalid user ph from 80.211.71.17 port 42844 ssh2

Mar 21 00:28:54 sd-53420 sshd\[18065\]: Invalid user zhaohao from 111.231.87.245
Mar 21 00:28:54 sd-53420 sshd\[18065\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=111.231.87.245
Mar 21 00:28:56 sd-53420 sshd\[18065\]: Failed password for invalid user zhaohao from 111.231.87.245 port 53588 ssh2
Mar 21 00:34:28 sd-53420 sshd\[19907\]: Invalid user hue from 111.231.87.245
Mar 21 00:34:28 sd-53420 sshd\[19907\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=111.231.87.245
...

Invalid user arthur from 209.141.34.228 port 32848

Mar 21 00:37:30 * sshd[28919]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.211.0.204
Mar 21 00:37:33 * sshd[28919]: Failed password for invalid user sz from 129.211.0.204 port 41322 ssh2

(sshd) Failed SSH login from 90.3.194.84 (FR/France/lfbn-idf3-1-875-84.w90-3.abo.wanadoo.fr): 5 in the last 3600 secs

Lines containing failures of 49.51.164.212
Mar 20 16:30:42 shared09 sshd[29898]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.51.164.212  user=r.r
Mar 20 16:30:44 shared09 sshd[29898]: Failed password for r.r from 49.51.164.212 port 57936 ssh2
Mar 20 16:30:44 shared09 sshd[29898]: Received disconnect from 49.51.164.212 port 57936:11: Bye Bye [preauth]
Mar 20 16:30:44 shared09 sshd[29898]: Disconnected from authenticating user r.r 49.51.164.212 port 57936 [preauth]
Mar 20 16:52:58 shared09 sshd[5380]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.51.164.212  user=r.r
Mar 20 16:53:00 shared09 sshd[5380]: Failed password for r.r from 49.51.164.212 port 36614 ssh2
Mar 20 16:53:00 shared09 sshd[5380]: Received disconnect from 49.51.164.212 port 36614:11: Bye Bye [preauth]
Mar 20 16:53:00 shared09 sshd[5380]: Disconnected from authenticating user r.r 49.51.164.212 port 36614 [preauth]
Ma........
------------------------------

Mar 21 01:00:41 odroid64 sshd\[9855\]: Invalid user teamspeak from 51.83.45.65
Mar 21 01:00:41 odroid64 sshd\[9855\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.83.45.65
...