标题：Client network socket disconnected before secure TLS connection was established 我在使用 SAP Spartacus...后台 OCC API 时，遇到如下错误消息： Error: Client network socket disconnected before secure TLS connection was established
PicGo RequestError: Error: tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1
kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - Connection to node 0 could not be established...kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - Connection to node 0 could not be established...kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - Connection to node 0 could not be established...kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - Connection to node 0 could not be established...kafka-producer-network-thread | producer-1] WARN org.apache.kafka.clients.NetworkClient - Connection to node 0 could not be established
最初这个问题是读者在我的 TCP 掘金小册的《TCP RST 攻击与如何杀掉一条 TCP 连接》小节中的一个留言提出的：「处于 ESTABLISHED 的连接，为什么还要响应 SYN 包？」...通过阅读这篇文章，你会了解到这些知识 ESTABLISHED 状态的连接收到乱序包会回复什么 Challenge ACK 的概念 ACK 报文限速是什么鬼 SystemTap 工具在 linux 内核追踪中的使用...State PID/Program name tcp 0 0 10.211.55.10:9090 10.211.55.20:50718 ESTABLISHED...原因分析 为了方便说明，我们记发送 SYN 报文的一端为 A，处于 ESTABLISHED 状态接收 SYN 报文的一端为 B，B 对收到的 SYN 包回复 ACK 的原因是想让对端 A 确认之前的连接是否已经失效...tcp_v4_rcv -> tcp_v4_do_rcv -> tcp_rcv_established -> tcp_validate_incoming -> tcp_send_ack
DB.DB().SetConnMaxLifetime(59 * time.Second)
在服务器本地可以使用命令行参数连接并且进行发布订阅操作，但是在外网环境就不可以了，SpringBoot连接报错： Connection to node 1 (localhost/127.0.0.1:9092) could not be established...9092 (LISTEN) java 11049 root 180u IPv4 1350151 0t0 TCP localhost:33640->localhost:9092 (ESTABLISHED...) java 11049 root 181u IPv4 1349272 0t0 TCP localhost:9092->localhost:33640 (ESTABLISHED)
2564 TCP [::1]:8080 [::1]:60425 ESTABLISHED 2564 TCP [::1]:8080 [::1]:60426 ESTABLISHED 2564 TCP...[::1]:8080 [::1]:60427 ESTABLISHED 2564 TCP [::1]:8080 [::1]:60428 ESTABLISHED 2564 TCP [::1]:8080...[::1]:60429 ESTABLISHED 2564 TCP [::1]:8080 [::1]:60508 ESTABLISHED 2564 TCP [::1]:8080 [::1]:60509...ESTABLISHED 2564 TCP [::1]:8080 [::1]:60510 ESTABLISHED 2564 TCP [::1]:8080 [::1]:60511 ESTABLISHED...1]:8080 ESTABLISHED 11876 TCP [::1]:60426 [::1]:8080 ESTABLISHED 11876 TCP [::1]:60427 [::1]:8080 ESTABLISHED
:3306 ESTABLISHED 6572 TCP 192.168.26.1:54340 192.168.26.128:3306 ESTABLISHED 6572 TCP 192.168.26.1:54341...192.168.26.129:3306 ESTABLISHED 6572 TCP 192.168.26.1:54342 192.168.26.128:3306 ESTABLISHED 6572 TCP...192.168.26.1:54343 192.168.26.128:3306 ESTABLISHED 6572 TCP 192.168.26.1:54344 192.168.26.129:3306 ESTABLISHED...:3306 ESTABLISHED 6572 TCP 192.168.26.1:54469 192.168.26.128:3306 ESTABLISHED 6572 TCP 192.168.26.1:54470...192.168.26.129:3306 ESTABLISHED 6572 TCP 192.168.26.1:54471 192.168.26.129:3306 ESTABLISHED 6572 TCP
25101/sshd: buckxu@ tcp 0 0 127.0.0.1:42485 127.0.0.1:50352 ESTABLISHED...33041/node tcp 0 0 127.0.0.1:42485 127.0.0.1:55622 ESTABLISHED...25171/node tcp 0 0 127.0.0.1:50354 127.0.0.1:42485 ESTABLISHED...128902/sshd: buckxu tcp 0 0 192.168.190.129:45782 192.168.190.128:1514 ESTABLISHED...2109/ossec-agentd tcp 0 0 127.0.0.1:50352 127.0.0.1:42485 ESTABLISHED
|grep $XDB1|grep $FLOW_PS|wc -l` FLOW_CNT117=`netstat -anlp|grep ESTABLISHED|grep $XDB2|grep $FLOW_PS...|wc -l` OUT_CNT116=`netstat -anlp|grep ESTABLISHED|grep $XDB1|grep $OUT_PS|wc -l` OUT_CNT117=`netstat...-anlp|grep ESTABLISHED|grep $XDB2|grep $OUT_PS|wc -l` SETT_CNT116=`netstat -anlp|grep ESTABLISHED|grep...$XDB1|grep $SETT_PS|wc -l` SETT_CNT117=`netstat -anlp|grep ESTABLISHED|grep $XDB2|grep $SETT_PS|wc -...-anlp|grep ESTABLISHED|grep $XDB2|grep $TASK_PS|wc -l` WEB_CNT116=`netstat -anlp|grep ESTABLISHED|grep
tcp 0 0 ::ffff:192.168.100.102:8983 ::ffff:192.168.100.10:42745 ESTABLISHED tcp 0...0 ::ffff:192.168.100.102:7574 ::ffff:192.168.100.10:33936 ESTABLISHED tcp 0 0 ::ffff...tcp 0 0 ::ffff:192.168.100.10:33947 ::ffff:192.168.100.102:7574 ESTABLISHED tcp 0...tcp 0 0 ::ffff:192.168.100.10:33938 ::ffff:192.168.100.102:7574 ESTABLISHED tcp 0...tcp 0 0 ::ffff:192.168.100.102:8983 ::ffff:192.168.100.10:42750 ESTABLISHED tcp 0
–state NEW, ESTABLISHED：“状态”匹配模块的选项。在这个例子中，只允许 NEW 和 ESTABLISHED 状态。...ESTABLISHED 状态用于从客户端到服务器的所有进一步请求。 接下来，允许传出（仅限 ESTABLISHED 状态）SSH 连接响应（针对相应的传入 SSH 连接请求）。...–state ESTABLISHED：由于这是一个响应规则，我们只允许 ESTABLISHED 连接（而不是任何 NEW 连接）。...ESTABLISHED 状态用于从服务器到外部的所有进一步请求。 接下来，允许传出（仅限 ESTABLISHED）SSH 连接响应（针对相应的传入 SSH 连接请求）。...–state ESTABLISHED：由于这是一个响应规则，我们只允许 ESTABLISHED 连接（而不是任何 NEW 连接）。
SSH iptables -A INPUT -i eth0 -p tcp -s 192.168.200.0/24 --dport 22 -m state --state NEW,ESTABLISHED...-j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT 6.允许进来的...） iptables -A INPUT -i eth0 -p tcp -m multiport --dports 22,80,443 -m state --state NEW,ESTABLISHED -...-j ACCEPTiptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT 9.允许外出的（...--state ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --dport 995 -m state --state NEW,ESTABLISHED
TCP 127.0.0.1:59734 DESKTOP-R5RIU58:59735 ESTABLISHED TCP...127.0.0.1:59735 DESKTOP-R5RIU58:59734 ESTABLISHED TCP...192.168.0.116:62953 124.232.169.203:https ESTABLISHED TCP...192.168.0.116:62981 119.0.83.46:https ESTABLISHED TCP...192.168.0.116:64220 115.236.118.34:https ESTABLISHED TCP
tcp 0 0 VM-f7217532-ce7b-469e:46277 VM-45a1f60b-551f-4deb:mysql ESTABLISHED tcp...0 0 VM-f7217532-ce7b-469e:mysql VM-31e27f6e-2e5f-4a2f:47932 ESTABLISHED tcp 0 0 VM-f7217532...tcp 0 0 VM-f7217532-ce7b-469e:mysql VM-31e27f6e-2e5f-4a2f:47864 ESTABLISHED tcp...tcp 0 0 VM-f7217532-ce7b-469e:mysql VM-31e27f6e-2e5f-4a2f:47861 ESTABLISHED tcp...-ce7b-469e:mysql VM-31e27f6e-2e5f-4a2f:47879 ESTABLISHED tcp 0 0 VM-f7217532-ce7b-469e:
tcp 0 0 192.168.172.146:54992 39.156.66.14:443 ESTABLISHED tcp 0 0...ESTABLISHED tcp 0 0 192.168.172.146:49432 104.19.197.151:443 ESTABLISHED tcp...:443 ESTABLISHED tcp 0 0 192.168.172.146:34844 85.12.30.226:443 ESTABLISHED...:80 ESTABLISHED tcp 0 0 192.168.172.146:38382 203.208.40.96:443 ESTABLISHED...ESTABLISHED tcp 0 0 192.168.172.146:43944 54.186.208.3:443 ESTABLISHED tcp
tcp4 0 0 192.168.1.100.56702 119.75.217.109.https ESTABLISHED tcp4 0 0...ESTABLISHED tcp4 0 0 192.168.1.100.56686 180.76.22.33.https ESTABLISHED tcp4...ESTABLISHED tcp4 0 0 192.168.1.100.56686 180.76.22.33.https ESTABLISHED tcp4...ESTABLISHED tcp4 0 0 192.168.1.100.56686 180.76.22.33.https ESTABLISHED tcp4...192.168.1.100.56681 119.75.217.109.https ESTABLISHED ...... . . . . . . 4.过滤记录 **awk采用== 、!
:56033 ESTABLISHED 3766/java tcp 0 0 172.17.7.81:57644 115.202.238.177...:27016 ESTABLISHED 3847/java tcp 0 0 172.17.7.81:36616 117.57.21.0...:57220 ESTABLISHED 3847/java tcp 0 0 172.17.7.81:48722 218.5.215.10...:45210 ESTABLISHED 4007/java tcp 0 0 172.17.7.81:60586 59.32.37.129...:59039 ESTABLISHED 3927/java tcp 0 0 172.17.7.81:42226 58.218.200.59
:64923 ESTABLISHED TCP 192.168.81.10:445 192.168.80.115:64933 ESTABLISHED TCP 192.168.81.31...ESTABLISHED TCP 192.168.8.176:1433 192.168.70.16:64744 ESTABLISHED TCP 192.168.18.128:...55276 192.168.70.18:443 ESTABLISHED TCP 192.168.81.31:59387 192.168.70.18:443 ESTABLISHED...:445 ESTABLISHED TCP 192.168.81.47:63280 192.168.70.45:445 ESTABLISHED TCP 192.168.81.47...ESTABLISHED TCP 192.168.10.178:49154 192.168.70.50:57491 ESTABLISHED TCP 192.168.10.179:
) mysqld 2970 mysql 41u IPv6 2347266 0t0 TCP 127.0.0.1:3306->127.0.0.1:34782 (ESTABLISHED...) mysqld 2970 mysql 42u IPv6 31596 0t0 TCP 127.0.0.1:3306->127.0.0.1:33954 (ESTABLISHED...) mysqld 2970 mysql 43u IPv6 31598 0t0 TCP 127.0.0.1:3306->127.0.0.1:33956 (ESTABLISHED...) mysqld 2970 mysql 50u IPv6 61604 0t0 TCP 127.0.0.1:3306->127.0.0.1:34638 (ESTABLISHED...) mysqld 2970 mysql 51u IPv6 108460 0t0 TCP 127.0.0.1:3306->127.0.0.1:37204 (ESTABLISHED
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