Tengo muchas de estas entradas en mi registro:
Sep 22 12:20:23 server0187 kernel: [ 7.267934] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=27738 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:23 server0187 kernel: [ 7.688848] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=27738 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:24 server0187 kernel: [ 7.992988] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=27738 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:32 server0187 kernel: [ 16.219594] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=52457 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:39 server0187 kernel: [ 23.217712] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=7040 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:40 server0187 kernel: [ 24.130220] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=7040 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:44 server0187 kernel: [ 28.063447] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=61.62.8.132 DST=se.rv.er.ip LEN=60 TOS=0x00 PREC=0x00 TTL=45 ID=33267 DF PROTO=TCP SPT=33345 DPT=23 WINDOW=14520 RES=0x00 SYN URGP=0
Sep 22 12:20:45 server0187 kernel: [ 29.063934] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=61.62.8.132 DST=se.rv.er.ip LEN=60 TOS=0x00 PREC=0x00 TTL=45 ID=33268 DF PROTO=TCP SPT=33345 DPT=23 WINDOW=14520 RES=0x00 SYN URGP=0
Sep 22 12:20:47 server0187 kernel: [ 31.063621] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=61.62.8.132 DST=se.rv.er.ip LEN=60 TOS=0x00 PREC=0x00 TTL=45 ID=33269 DF PROTO=TCP SPT=33345 DPT=23 WINDOW=14520 RES=0x00 SYN URGP=0
Sep 22 12:20:50 server0187 kernel: [ 34.272558] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=37595 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:50 server0187 kernel: [ 34.667044] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=37595 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:21:08 server0187 kernel: [ 52.296316] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=22917 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:21:39 server0187 kernel: [ 83.646607] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=151.233.57.112 DST=se.rv.er.ip LEN=44 TOS=0x00 PREC=0x00 TTL=37 ID=56703 PROTO=TCP SPT=25625 DPT=23 WINDOW=30217 RES=0x00 SYN URGP=0
mis reglas de ufw
son bastante estándar:
22/tcp (OpenSSH) ALLOW IN Anywhere
80,443/tcp (Nginx Full) ALLOW IN Anywhere
80,443/tcp ALLOW IN Anywhere
25 ALLOW IN Anywhere
143 ALLOW IN Anywhere
993 ALLOW IN Anywhere
22 ALLOW IN Anywhere
21 ALLOW IN Anywhere
21/tcp ALLOW IN Anywhere
22/tcp (OpenSSH (v6)) ALLOW IN Anywhere (v6)
80,443/tcp (Nginx Full (v6)) ALLOW IN Anywhere (v6)
80,443/tcp (v6) ALLOW IN Anywhere (v6)
25 (v6) ALLOW IN Anywhere (v6)
143 (v6) ALLOW IN Anywhere (v6)
993 (v6) ALLOW IN Anywhere (v6)
22 (v6) ALLOW IN Anywhere (v6)
21 (v6) ALLOW IN Anywhere (v6)
21/tcp (v6) ALLOW IN Anywhere (v6)
¿Cómo me deshago de estos?