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Unauthorised access (Oct  4) SRC=110.244.187.108 LEN=40 TTL=49 ID=25748 TCP DPT=8080 WINDOW=29810 SYN

Oct  4 09:10:59 xeon sshd[47351]: Failed password for root from 41.169.7.177 port 53068 ssh2

$f2bV_matches

2019-10-04 00:25:23 dovecot_login authenticator failed for (lerctr.org) [111.231.85.239]:37930 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=nologin@lerctr.org)
2019-10-04 00:25:44 dovecot_login authenticator failed for (lerctr.org) [111.231.85.239]:39662 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=admin@lerctr.org)
2019-10-04 00:26:00 dovecot_login authenticator failed for (lerctr.org) [111.231.85.239]:42492 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=abuse@lerctr.org)
...

Oct  4 04:34:11 venus sshd\[1657\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=62.234.154.56  user=root
Oct  4 04:34:13 venus sshd\[1657\]: Failed password for root from 62.234.154.56 port 49815 ssh2
Oct  4 04:39:33 venus sshd\[1789\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=62.234.154.56  user=root
...

Oct  4 07:06:15 www sshd\[227262\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=46.101.224.184  user=root
Oct  4 07:06:17 www sshd\[227262\]: Failed password for root from 46.101.224.184 port 47900 ssh2
Oct  4 07:10:05 www sshd\[227568\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=46.101.224.184  user=root
...

Oct  4 06:52:45 MK-Soft-VM4 sshd[17720]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=193.68.57.155 
Oct  4 06:52:47 MK-Soft-VM4 sshd[17720]: Failed password for invalid user Pa$$2017 from 193.68.57.155 port 39630 ssh2
...

*Port Scan* detected from 121.15.2.178 (CN/China/-). 4 hits in the last 90 seconds

Oct  4 11:09:17 mail sshd\[11042\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.247.207.56  user=root
Oct  4 11:09:19 mail sshd\[11042\]: Failed password for root from 49.247.207.56 port 36206 ssh2
Oct  4 11:13:42 mail sshd\[11639\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.247.207.56  user=root
Oct  4 11:13:44 mail sshd\[11639\]: Failed password for root from 49.247.207.56 port 48274 ssh2
Oct  4 11:18:13 mail sshd\[12252\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.247.207.56  user=root

2019-10-03T20:51:49.714080-07:00 suse-nuc sshd[14319]: Invalid user hue from 106.13.99.245 port 38218
...

postfix (unknown user, SPF fail or relay access denied)

Oct  4 05:47:49 nextcloud sshd\[18887\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.37.129.235  user=root
Oct  4 05:47:51 nextcloud sshd\[18887\]: Failed password for root from 54.37.129.235 port 43992 ssh2
Oct  4 05:51:37 nextcloud sshd\[24552\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=54.37.129.235  user=root
...

Oct  1 20:29:08 rhein postfix/smtpd[9766]: warning: hostname 97-86-21-81-pppoe-dynamic-ip.ultel-dot-net does not resolve to address 81.21.86.97: Name or service not known
Oct  1 20:29:08 rhein postfix/smtpd[9766]: connect from unknown[81.21.86.97]
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct x@x
Oct  1 20:29:10 rhein postfix/smtpd[9766]: lost connection after RCPT from unknown[81.21.86.97]
Oct  1 20:29:10 rhein postfix/smtpd[9766]: disconnect from unknown[81.21.86.97]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=81.21.86.97

Oct  4 11:48:52 MK-Soft-VM4 sshd[22246]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.68.189.69 
Oct  4 11:48:54 MK-Soft-VM4 sshd[22246]: Failed password for invalid user Bienvenue2016 from 51.68.189.69 port 37970 ssh2
...