Apr 21 10:21:11 Enigma sshd[31269]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.30.167  user=root
Apr 21 10:21:13 Enigma sshd[31269]: Failed password for root from 222.186.30.167 port 30602 ssh2
Apr 21 10:21:11 Enigma sshd[31269]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.30.167  user=root
Apr 21 10:21:13 Enigma sshd[31269]: Failed password for root from 222.186.30.167 port 30602 ssh2
Apr 21 10:21:15 Enigma sshd[31269]: Failed password for root from 222.186.30.167 port 30602 ssh2

k+ssh-bruteforce

Dovecot Invalid User Login Attempt.

107.180.227.163 - - [21/Apr/2020:08:48:43 +0200] "GET /wp-login.php HTTP/1.1" 200 6463 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"
107.180.227.163 - - [21/Apr/2020:08:48:56 +0200] "POST /wp-login.php HTTP/1.1" 200 7362 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"
107.180.227.163 - - [21/Apr/2020:08:48:58 +0200] "POST /xmlrpc.php HTTP/1.1" 200 427 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"

2020/04/21 05:49:22 [error] 2371150#2371150: *90055 open() "/usr/share/nginx/html/cgi-bin/test-cgi" failed (2: No such file or directory), client: 129.146.70.212, server: _, request: "GET /cgi-bin/test-cgi HTTP/1.1", host: "panoramosiboersch.de"
2020/04/21 05:49:24 [error] 2371150#2371150: *90116 open() "/usr/share/nginx/html/horde/imp/test.php" failed (2: No such file or directory), client: 129.146.70.212, server: _, request: "GET /horde/imp/test.php HTTP/1.1", host: "panoramosiboersch.de"

Apr 21 07:19:12 Enigma sshd[14737]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=v150-95-181-49.a0e3.g.tyo1.static.cnode.io
Apr 21 07:19:12 Enigma sshd[14737]: Invalid user nexus from 150.95.181.49 port 36630
Apr 21 07:19:15 Enigma sshd[14737]: Failed password for invalid user nexus from 150.95.181.49 port 36630 ssh2
Apr 21 07:23:09 Enigma sshd[15278]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=v150-95-181-49.a0e3.g.tyo1.static.cnode.io  user=root
Apr 21 07:23:11 Enigma sshd[15278]: Failed password for root from 150.95.181.49 port 43046 ssh2

(From AllenandCo@gmail.com) It looks like you've misspelled the word "improvment" on your website.  I thought you would like to know :).  Silly mistakes can ruin your site's credibility.  I've used a tool called SpellScan.com in the past to keep mistakes off of my website.

-Kerri

Invalid user testadmin from 119.28.214.72 port 40162

Apr 21 05:53:51 ns382633 sshd\[26712\]: Invalid user admin from 180.180.144.113 port 13487
Apr 21 05:53:51 ns382633 sshd\[26714\]: Invalid user admin from 180.180.144.113 port 3752
Apr 21 05:53:52 ns382633 sshd\[26712\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.180.144.113
Apr 21 05:53:52 ns382633 sshd\[26714\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.180.144.113
Apr 21 05:53:54 ns382633 sshd\[26712\]: Failed password for invalid user admin from 180.180.144.113 port 13487 ssh2
Apr 21 05:53:54 ns382633 sshd\[26714\]: Failed password for invalid user admin from 180.180.144.113 port 3752 ssh2

Tried to start IPSEC VPN

Apr 21 05:31:09 web01.agentur-b-2.de postfix/smtpd[1805328]: NOQUEUE: reject: RCPT from unknown[63.82.50.249]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo=
Apr 21 05:35:32 web01.agentur-b-2.de postfix/smtpd[1804130]: NOQUEUE: reject: RCPT from unknown[63.82.50.249]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo=
Apr 21 05:39:09 web01.agentur-b-2.de postfix/smtpd[1804130]: NOQUEUE: reject: RCPT from unknown[63.82.50.249]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo=
Apr 21 05:39:59 web01.agentur-b-2.de postfix/smtpd[1804130]: NOQUEUE: reject: RCPT from unknown[63.82.50.249]: 450 4.7.1 : H

Apr 21 06:38:49 web8 sshd\[21722\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=76.103.161.19  user=root
Apr 21 06:38:52 web8 sshd\[21722\]: Failed password for root from 76.103.161.19 port 36678 ssh2
Apr 21 06:43:12 web8 sshd\[23996\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=76.103.161.19  user=root
Apr 21 06:43:13 web8 sshd\[23996\]: Failed password for root from 76.103.161.19 port 55260 ssh2
Apr 21 06:47:33 web8 sshd\[26175\]: Invalid user admin from 76.103.161.19

2020-04-21T07:55:22.706433l03.customhost.org.uk postfix/smtps/smtpd[12564]: warning: unknown[78.128.113.75]: SASL PLAIN authentication failed: authentication failure
2020-04-21T07:55:28.047927l03.customhost.org.uk postfix/smtps/smtpd[12564]: warning: unknown[78.128.113.75]: SASL PLAIN authentication failed: authentication failure
2020-04-21T08:04:18.975191l03.customhost.org.uk postfix/smtps/smtpd[13477]: warning: unknown[78.128.113.75]: SASL PLAIN authentication failed: authentication failure
2020-04-21T08:04:23.955976l03.customhost.org.uk postfix/smtps/smtpd[13477]: warning: unknown[78.128.113.75]: SASL PLAIN authentication failed: authentication failure
...

Apr 21 09:04:21 debian-2gb-nbg1-2 kernel: \[9711620.469777\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=194.26.29.210 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=24127 PROTO=TCP SPT=51805 DPT=21912 WINDOW=1024 RES=0x00 SYN URGP=0

Apr 21 08:39:36 pve1 sshd[29420]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.6.231.114 
Apr 21 08:39:38 pve1 sshd[29420]: Failed password for invalid user ubuntu from 112.6.231.114 port 43853 ssh2
...