Sep  7 13:10:07 mail.srvfarm.net postfix/smtpd[1058629]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed: 
Sep  7 13:10:07 mail.srvfarm.net postfix/smtpd[1058629]: lost connection after AUTH from unknown[210.16.88.122]
Sep  7 13:11:33 mail.srvfarm.net postfix/smtpd[1053353]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed: 
Sep  7 13:11:34 mail.srvfarm.net postfix/smtpd[1053353]: lost connection after AUTH from unknown[210.16.88.122]
Sep  7 13:14:27 mail.srvfarm.net postfix/smtpd[1072432]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed:

Sep  7 13:10:07 mail.srvfarm.net postfix/smtpd[1058629]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed: 
Sep  7 13:10:07 mail.srvfarm.net postfix/smtpd[1058629]: lost connection after AUTH from unknown[210.16.88.122]
Sep  7 13:11:33 mail.srvfarm.net postfix/smtpd[1053353]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed: 
Sep  7 13:11:34 mail.srvfarm.net postfix/smtpd[1053353]: lost connection after AUTH from unknown[210.16.88.122]
Sep  7 13:14:27 mail.srvfarm.net postfix/smtpd[1072432]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed:

Sep  7 13:10:07 mail.srvfarm.net postfix/smtpd[1058629]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed: 
Sep  7 13:10:07 mail.srvfarm.net postfix/smtpd[1058629]: lost connection after AUTH from unknown[210.16.88.122]
Sep  7 13:11:33 mail.srvfarm.net postfix/smtpd[1053353]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed: 
Sep  7 13:11:34 mail.srvfarm.net postfix/smtpd[1053353]: lost connection after AUTH from unknown[210.16.88.122]
Sep  7 13:14:27 mail.srvfarm.net postfix/smtpd[1072432]: warning: unknown[210.16.88.122]: SASL PLAIN authentication failed:

Aug 27 08:45:51 mail.srvfarm.net postfix/smtps/smtpd[1433546]: warning: unknown[210.16.88.130]: SASL PLAIN authentication failed: 
Aug 27 08:45:51 mail.srvfarm.net postfix/smtps/smtpd[1433546]: lost connection after AUTH from unknown[210.16.88.130]
Aug 27 08:51:39 mail.srvfarm.net postfix/smtps/smtpd[1434623]: warning: unknown[210.16.88.130]: SASL PLAIN authentication failed: 
Aug 27 08:51:39 mail.srvfarm.net postfix/smtps/smtpd[1434623]: lost connection after AUTH from unknown[210.16.88.130]
Aug 27 08:54:46 mail.srvfarm.net postfix/smtps/smtpd[1437774]: warning: unknown[210.16.88.130]: SASL PLAIN authentication failed:

Attempted Brute Force (dovecot)

Brute force attempt

Aug 16 05:41:19 mail.srvfarm.net postfix/smtps/smtpd[1890600]: warning: unknown[210.16.88.232]: SASL PLAIN authentication failed: 
Aug 16 05:41:19 mail.srvfarm.net postfix/smtps/smtpd[1890600]: lost connection after AUTH from unknown[210.16.88.232]
Aug 16 05:41:36 mail.srvfarm.net postfix/smtpd[1907800]: warning: unknown[210.16.88.232]: SASL PLAIN authentication failed: 
Aug 16 05:41:36 mail.srvfarm.net postfix/smtpd[1907800]: lost connection after AUTH from unknown[210.16.88.232]
Aug 16 05:43:42 mail.srvfarm.net postfix/smtps/smtpd[1890604]: warning: unknown[210.16.88.232]: SASL PLAIN authentication failed:

SASL PLAIN auth failed: ruser=...

(smtpauth) Failed SMTP AUTH login from 210.16.88.221 (IN/India/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-07-09 08:27:47 plain authenticator failed for ([210.16.88.221]) [210.16.88.221]: 535 Incorrect authentication data (set_id=info@zarlif.com)

SSH invalid-user multiple login try

(smtpauth) Failed SMTP AUTH login from 210.16.88.205 (IN/India/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-07-07 08:20:04 plain authenticator failed for ([210.16.88.205]) [210.16.88.205]: 535 Incorrect authentication data (set_id=info@granrif.com)

Jun 25 21:58:43 mail.srvfarm.net postfix/smtpd[2056272]: warning: unknown[210.16.88.130]: SASL PLAIN authentication failed: 
Jun 25 21:58:43 mail.srvfarm.net postfix/smtpd[2056272]: lost connection after AUTH from unknown[210.16.88.130]
Jun 25 22:03:08 mail.srvfarm.net postfix/smtpd[2055920]: warning: unknown[210.16.88.130]: SASL PLAIN authentication failed: 
Jun 25 22:03:08 mail.srvfarm.net postfix/smtpd[2055920]: lost connection after AUTH from unknown[210.16.88.130]
Jun 25 22:06:00 mail.srvfarm.net postfix/smtpd[2054387]: warning: unknown[210.16.88.130]: SASL PLAIN authentication failed:

(smtpauth) Failed SMTP AUTH login from 210.16.88.244 (IN/India/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-06-12 08:20:44 plain authenticator failed for ([210.16.88.244]) [210.16.88.244]: 535 Incorrect authentication data (set_id=marketin@toliddaru.ir)

Jun  5 16:02:48 mail.srvfarm.net postfix/smtpd[3113153]: warning: unknown[210.16.88.38]: SASL PLAIN authentication failed: 
Jun  5 16:02:48 mail.srvfarm.net postfix/smtpd[3113153]: lost connection after AUTH from unknown[210.16.88.38]
Jun  5 16:09:08 mail.srvfarm.net postfix/smtps/smtpd[3129519]: warning: unknown[210.16.88.38]: SASL PLAIN authentication failed: 
Jun  5 16:09:08 mail.srvfarm.net postfix/smtps/smtpd[3129519]: lost connection after AUTH from unknown[210.16.88.38]
Jun  5 16:10:40 mail.srvfarm.net postfix/smtpd[3129213]: warning: unknown[210.16.88.38]: SASL PLAIN authentication failed:

Jun  5 17:10:11 mail.srvfarm.net postfix/smtpd[3136972]: warning: unknown[210.16.88.126]: SASL PLAIN authentication failed: 
Jun  5 17:10:11 mail.srvfarm.net postfix/smtpd[3136972]: lost connection after AUTH from unknown[210.16.88.126]
Jun  5 17:14:18 mail.srvfarm.net postfix/smtps/smtpd[3137557]: warning: unknown[210.16.88.126]: SASL PLAIN authentication failed: 
Jun  5 17:14:18 mail.srvfarm.net postfix/smtps/smtpd[3137557]: lost connection after AUTH from unknown[210.16.88.126]
Jun  5 17:16:20 mail.srvfarm.net postfix/smtpd[3150162]: warning: unknown[210.16.88.126]: SASL PLAIN authentication failed:

Port scanning [4 denied]

Sep  7 18:52:26 pl3server sshd[7544]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=179.57.206.66  user=r.r
Sep  7 18:52:27 pl3server sshd[7546]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=179.57.206.66  user=r.r
Sep  7 18:52:28 pl3server sshd[7544]: Failed password for r.r from 179.57.206.66 port 37472 ssh2
Sep  7 18:52:28 pl3server sshd[7544]: Connection closed by 179.57.206.66 port 37472 [preauth]
Sep  7 18:52:28 pl3server sshd[7546]: Failed password for r.r from 179.57.206.66 port 37540 ssh2


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=179.57.206.66

 TCP (SYN) 113.69.25.253:24746 -> port 8080, len 44

" "

www.geburtshaus-fulda.de 112.196.72.188 [08/Sep/2020:16:34:57 +0200] "POST /wp-login.php HTTP/1.1" 200 6753 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"
www.geburtshaus-fulda.de 112.196.72.188 [08/Sep/2020:16:34:59 +0200] "POST /wp-login.php HTTP/1.1" 200 6754 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0"

Sep  7 19:26:00 scw-focused-cartwright sshd[30118]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=31.202.195.1
Sep  7 19:26:03 scw-focused-cartwright sshd[30118]: Failed password for invalid user user from 31.202.195.1 port 49052 ssh2

Sep  8 12:59:30 firewall sshd[5455]: Failed password for root from 129.226.165.250 port 45048 ssh2
Sep  8 13:03:53 firewall sshd[5588]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.226.165.250  user=root
Sep  8 13:03:54 firewall sshd[5588]: Failed password for root from 129.226.165.250 port 35508 ssh2
...

[2020-09-08 12:17:16] NOTICE[1194] chan_sip.c: Registration from '"1108"' failed for '212.83.163.170:7177' - Wrong password
[2020-09-08 12:17:16] SECURITY[1233] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-09-08T12:17:16.618-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1108",SessionID="0x7f2ddc945c58",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/212.83.163.170/7177",Challenge="27ca29d7",ReceivedChallenge="27ca29d7",ReceivedHash="dd2475d7d52369d174cf3ab5a2784a5d"
[2020-09-08 12:17:27] NOTICE[1194] chan_sip.c: Registration from '"1104"' failed for '212.83.163.170:6957' - Wrong password
[2020-09-08 12:17:27] SECURITY[1233] res_security_log.c: SecurityEvent="InvalidPassword",EventTV="2020-09-08T12:17:27.698-0400",Severity="Error",Service="SIP",EventVersion="2",AccountID="1104",SessionID="0x7f2ddc181df8",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/2
...

Here more information about 193.27.228.242 
info: [Russia] 49505 OOO Network of data-centers Selectel 
Connected: 5 servere(s) 
Reason: ssh 
Portscan/portflood
Ports: 21,22,23,81,993 
Services: hosts2-ns,imaps,ssh,ftp,telnet 
servere: Europe/Moscow (UTC+3) 
Found at blocklist: spfbl.net, abuseIPDB.com
myIP:* 
 
[2020-09-06 15:54:49] (tcp) myIP:81 <- 193.27.228.242:54580
[2020-09-06 16:25:40] (tcp) myIP:993 <- 193.27.228.242:54580
[2020-09-06 17:45:53] (tcp) myIP:22 <- 193.27.228.242:54580
[2020-09-06 17:49:19] (tcp) myIP:21 <- 193.27.228.242:54580
[2020-09-06 21:27:39] (tcp) myIP:23 <- 193.27.228.242:54580


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=193.27.228.242

Honeypot attack, port: 445, PTR: 111-241-109-183.dynamic-ip.hinet.net.

 TCP (SYN) 185.232.30.130:58656 -> port 33896, len 44

Sep  8 09:17:49 cumulus sshd[32198]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.17.214  user=r.r
Sep  8 09:17:52 cumulus sshd[32198]: Failed password for r.r from 106.12.17.214 port 39848 ssh2
Sep  8 09:17:52 cumulus sshd[32198]: Received disconnect from 106.12.17.214 port 39848:11: Bye Bye [preauth]
Sep  8 09:17:52 cumulus sshd[32198]: Disconnected from 106.12.17.214 port 39848 [preauth]
Sep  8 09:34:18 cumulus sshd[734]: Invalid user avahi from 106.12.17.214 port 52788
Sep  8 09:34:18 cumulus sshd[734]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.12.17.214
Sep  8 09:34:21 cumulus sshd[734]: Failed password for invalid user avahi from 106.12.17.214 port 52788 ssh2
Sep  8 09:34:21 cumulus sshd[734]: Received disconnect from 106.12.17.214 port 52788:11: Bye Bye [preauth]
Sep  8 09:34:21 cumulus sshd[734]: Disconnected from 106.12.17.214 port 52788 [preauth]
Sep  8 09:38:24........
-------------------------------

Sep  7 18:37:21 ovpn sshd[12392]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=187.74.66.16  user=r.r
Sep  7 18:37:23 ovpn sshd[12392]: Failed password for r.r from 187.74.66.16 port 48892 ssh2
Sep  7 18:37:23 ovpn sshd[12392]: Received disconnect from 187.74.66.16 port 48892:11: Bye Bye [preauth]
Sep  7 18:37:23 ovpn sshd[12392]: Disconnected from 187.74.66.16 port 48892 [preauth]
Sep  7 18:44:07 ovpn sshd[14034]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=187.74.66.16  user=r.r
Sep  7 18:44:09 ovpn sshd[14034]: Failed password for r.r from 187.74.66.16 port 58917 ssh2
Sep  7 18:44:09 ovpn sshd[14034]: Received disconnect from 187.74.66.16 port 58917:11: Bye Bye [preauth]
Sep  7 18:44:09 ovpn sshd[14034]: Disconnected from 187.74.66.16 port 58917 [preauth]
Sep  7 18:46:39 ovpn sshd[14697]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=187.74.........
------------------------------

2020-09-07T23:27:04.0818711495-001 sshd[60455]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.111.242  user=root
2020-09-07T23:27:06.0050381495-001 sshd[60455]: Failed password for root from 180.76.111.242 port 60978 ssh2
2020-09-07T23:36:51.5297911495-001 sshd[60944]: Invalid user raudel from 180.76.111.242 port 32806
2020-09-07T23:36:51.5328781495-001 sshd[60944]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=180.76.111.242
2020-09-07T23:36:51.5297911495-001 sshd[60944]: Invalid user raudel from 180.76.111.242 port 32806
2020-09-07T23:36:53.3754901495-001 sshd[60944]: Failed password for invalid user raudel from 180.76.111.242 port 32806 ssh2
...

firewall-block, port(s): 445/tcp