firewall-block, port(s): 16060/udp

Unauthorized IMAP connection attempt

Unauthorized connection attempt from IP address 187.79.192.112 on Port 445(SMB)

Jan  7 07:57:41 debian sshd[16008]: Unable to negotiate with 120.132.124.237 port 46556: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 [preauth]
Jan  7 08:03:29 debian sshd[16241]: Unable to negotiate with 120.132.124.237 port 41056: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 [preauth]
...

Jan  7 20:31:45 webhost01 sshd[32259]: Failed password for root from 49.88.112.76 port 63625 ssh2
...

Unauthorized connection attempt from IP address 200.223.251.206 on Port 445(SMB)

Jan  7 12:45:31 node1 sshd[29755]: Address 51.83.255.93 maps to ip-51-83-255.eu, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
Jan  7 12:45:31 node1 sshd[29755]: Received disconnect from 51.83.255.93: 11: Normal Shutdown, Thank you for playing [preauth]
Jan  7 12:45:47 node1 sshd[29766]: Address 51.83.255.93 maps to ip-51-83-255.eu, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
Jan  7 12:45:47 node1 sshd[29766]: Received disconnect from 51.83.255.93: 11: Normal Shutdown, Thank you for playing [preauth]
Jan  7 12:46:03 node1 sshd[29835]: Address 51.83.255.93 maps to ip-51-83-255.eu, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
Jan  7 12:46:03 node1 sshd[29835]: Received disconnect from 51.83.255.93: 11: Normal Shutdown, Thank you for playing [preauth]
Jan  7 12:46:18 node1 sshd[29877]: Address 51.83.255.93 maps to ip-51-83-255.eu, but this does not map back to the address - POSSIBLE BREAK-IN ATTE........
-------------------------------

Unauthorized connection attempt from IP address 222.173.241.10 on Port 445(SMB)

Unauthorized connection attempt from IP address 1.160.55.54 on Port 445(SMB)

2020-01-07 07:03:57 H=(AUGZFC) [115.229.1.140]:64040 I=[192.147.25.65]:25 F= rejected RCPT <1174615365@qq.com>: RBL: found in thrukfz5b56tq6xao6odgdyjrq.zen.dq.spamhaus.net (127.0.0.4, 127.0.0.3, 127.0.0.11) (https://www.spamhaus.org/query/ip/115.229.1.140)
2020-01-07 07:04:02 dovecot_login authenticator failed for (opo64IuORa) [115.229.1.140]:60641 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=ler@lerctr.org)
2020-01-07 07:04:11 dovecot_login authenticator failed for (Y8VPsx7e) [115.229.1.140]:53168 I=[192.147.25.65]:25: 535 Incorrect authentication data (set_id=ler@lerctr.org)
...

Jan  7 03:01:04 sachi sshd\[13689\]: Invalid user wrd from 142.93.140.242
Jan  7 03:01:04 sachi sshd\[13689\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=142.93.140.242
Jan  7 03:01:06 sachi sshd\[13689\]: Failed password for invalid user wrd from 142.93.140.242 port 52518 ssh2
Jan  7 03:03:29 sachi sshd\[13865\]: Invalid user lna from 142.93.140.242
Jan  7 03:03:29 sachi sshd\[13865\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=142.93.140.242

Jan  7 14:04:05 debian-2gb-nbg1-2 kernel: \[661563.256900\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=185.176.27.246 DST=195.201.40.59 LEN=40 TOS=0x00 PREC=0x00 TTL=246 ID=48083 PROTO=TCP SPT=41416 DPT=7790 WINDOW=1024 RES=0x00 SYN URGP=0

SSH auth scanning - multiple failed logins

Invalid user fzl from 129.205.112.253 port 46664
pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.205.112.253
Failed password for invalid user fzl from 129.205.112.253 port 46664 ssh2
Invalid user systemd-journal from 129.205.112.253 port 41664
pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=129.205.112.253

TCP Port Scanning