1.服务器是实体机，防火墙已关
2.在外部用ping和telnet都通了
3.MQTTfx能够连接其他服务器
4.该服务器从来没有连接成功过
5.log如下
2020-10-20 10:06:19,564 INFO --- BrokerConnectorController : onConnect
2020-10-20 10:06:19,565 INFO --- ScriptsController : Clear console.
2020-10-20 10:06:19,567 INFO --- MqttFX ClientModel : MqttClient with ID e997203411c94393a97d31062992b22c assigned.
2020-10-20 10:06:37,714 ERROR --- MqttFX ClientModel : Error when connecting
org.eclipse.paho.client.mqttv3.MqttException: Connection lost
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:181) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_181]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_181]
at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_181]
at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_181]
at java.io.DataInputStream.readByte(Unknown Source) ~[?:1.8.0_181]
at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:92) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?]
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:133) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?]
... 7 more
2020-10-20 10:06:37,717 ERROR --- MqttFX ClientModel : Please verify your Settings (e.g. Broker Address, Broker Port & Client ID) and the user credentials!
org.eclipse.paho.client.mqttv3.MqttException: Connection lost
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:181) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_181]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_181]
at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_181]
at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_181]
at java.io.DataInputStream.readByte(Unknown Source) ~[?:1.8.0_181]
at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:92) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?]
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:133) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?]
... 7 more
2020-10-20 10:06:37,720 INFO --- ScriptsController : Clear console.
2020-10-20 10:06:37,721 ERROR --- BrokerConnectService : Connection lost
