engenou opened a new issue, #15340: URL: https://github.com/apache/dubbo/issues/15340
### Pre-check - [x] I am sure that all the content I provide is in English. ### Search before asking - [x] I had searched in the [issues](https://github.com/apache/dubbo/issues?q=is%3Aissue) and found no similar issues. ### Apache Dubbo Component Java SDK (apache/dubbo) ### Dubbo Version Dubbo version: 3.2.5 Java version: 17 springboot：3.4.0 zookeeper：3.8.4 ### Steps to reproduce this issue ServiceA is the provider, and ServiceB is the consumer. When ServiceA is redeployed, the IP address changes. The specific steps are: after the new instance starts successfully, it registers with Zookeeper, and the old instance is destroyed. During the deployment period, Service B (the consumer) reports an error indicating that it cannot connect to the provider (the new instance). The exception information is as follows: 2025-04-19 10:00:00,108(NettyClientWorker-5-2] ERROR NettyConnectionHandler:- [DUBBO1 Fail to connect to null dubbo version: 3.2.5, current host xx.xx.xx.xx, error code: 6-16. This may be caused by,go to https://dubbo.apache.org/faq/6/16 to find instructions. org.apache.dubbo.remoting.RemotingException:client(url:DefaultServiceInstance(serviceName='service-provider’ host='xx.xx.xx.xx, port=54xxx enabled=true, healthy=true, metadata={dubbo.endpoints=[{"port":54xxx,"protocol":"tri"}], dubbo.metadata-service.url-params={"preferserializati on":"hessian2","timeout":"10000","version":"1.0.0","dubbo":"2.0.2*,"release":"3.2.5","side:"provider","port":"63xxx",protocol: meta”), dubbo.metadata.revision=xxxxxxcc8cede644a069bb5875xxxxxx, dubbo.metadata.storage-type=local, timestamp=1742637xxxxxx)}) failed to connect to server /xx.xx.xx.xx:54xxx, error message is:拒绝连接:/xx.xx.xx.xx:54xxx at org.apache.dubbo.remoting.transport.netty4.NettyConnectionClient.doConnect(NettyConnectionClient.java:179) ~[dubbo-3.2.5.jarl/:3.2.5] at org.apache.dubbo.remoting.transport.netty4.NettyConnectionHandlerlambda$reconnect$O(NettyConnectionHandlerjava:86) ~[dubbo-3.2.5.jar!/:3.2.5] at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)~[netty-common-4.1.118.Finaljar!/:4.1.118.Final] at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTaskjava:156)~[netty-common-4.1.118.Final.jar1/:4.1.118.Final] atio.netty.util.concurrent.AbstractEventExecutorrunTask(AbstractEventExecutorjava:173)~[netty-common-4.1.118.Final.jar1/:4.1.118.Final] atio.netty.util.concurrent.AbstractEventExecutorsafeExecute(AbstractEventExecutorjava:166)~[netty-common-4.1.118.Final.jar!/:4.1.118.Final] atio.netty.util.concurrent.SingleThreadEventExecutorrunAllTasks(SingleThreadEventExecutorjava:472)~[netty-common-4.1.118.Final.jarl/:4.1.118.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)~[netty-transport-4.1.118.Finaljarl/:4.1.118.Final] atio.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutorjava:998)~[netty-common-4.1.118.Final.jar!/:4.1.118.Final] atio.netty.utilinternal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)~[netty-common-4.1.118.Finaljar!/:4.1.118.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)~[netty-common-4.1.118.Final.jarl/:4.1.118.Final] at java.base/java.lang.Thread.run(Thread.java:840) [?:?] Caused by:io.netty.channel.AbstractChannel$AnnotatedConnectException: 拒绝连接: /xx.xx.xx.xx:54xxx Caused by:java.net.ConnectException: 拒绝连接 at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[?:2] atjava.base/sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[?:?] at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:946) ~[2:2?] at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:336) ~[netty-transport-4.1.118.Finaljar!/:4.1.118.Final] atio.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:339) ~[netty-transport-4.1.118.Final.jarl/:4.1.118.Final] atio.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:784)~[netty-transport-4.1.118.Final.jarl/:4.1.118.Final] atio.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:732) ~[netty-transport-4.1.118.Final.jarl/:4.1.118.Final] atio.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:658)~[netty-transport-4.1.118.Final.jar!/:4.1.118.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.118.Finaljarl/:4.1.118.Final] ...4 more ### What you expected to happen The consumer connects to the provider normally. ### Anything else _No response_ ### Are you willing to submit a pull request to fix on your own? - [ ] Yes I am willing to submit a pull request on my own! ### Code of Conduct - [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. 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