Loosing node connection after update to 7.9.2

Hello,

I have one node which is not reconecting after updating from 7.7.1 to 7.9.2 my cluster of three nodes.
Here is the error, I don't understand why it's a connection problem as nothing changed ?

[2020-10-08T11:22:21,962][INFO ][o.e.c.c.JoinHelper ] [XXXXXXELK03PLV] failed to join {XXXXXXELK01PLV}{IyEy66H5R6CeaB7_IAAeTQ}{0zTBfK5vRyej5P9eDWVWrA}{10.11.10.164}{10.11.10.164:9300}{dilmrt}{ml.machine_memory=25047142400, ml.max_open_jobs=20, xpack.installed=true, transform.node=true} with JoinRequest{sourceNode={XXXXXXELK03PLV}{rcBEbffpTu-D7TpCUk-olQ}{wJFr8zzrQCS7zEvipAjAGA}{10.11.10.166}{10.11.10.166:9300}{dilmrt}{ml.machine_memory=25055739904, xpack.installed=true, transform.node=true, ml.max_open_jobs=20}, minimumTerm=18, optionalJoin=Optional.empty}
org.elasticsearch.transport.RemoteTransportException: [XXXXXXELK01PLV][10.11.10.164:9300][internal:cluster/coordination/join]
Caused by: org.elasticsearch.transport.ConnectTransportException: [XXXXXXELK03PLV][10.11.10.166:9300] connect_exception
at org.elasticsearch.transport.TcpTransport$ChannelsConnectedListener.onFailure(TcpTransport.java:966) ~[elasticsearch-7.9.2.jar:7.9.2]
at org.elasticsearch.action.ActionListener.lambda$toBiConsumer$2(ActionListener.java:198) ~[elasticsearch-7.9.2.jar:7.9.2]
at org.elasticsearch.common.concurrent.CompletableContext.lambda$addListener$0(CompletableContext.java:42) ~[elasticsearch-core-7.9.2.jar:7.9.2]
at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:859) ~[?:?]
at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:837) ~[?:?]
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506) ~[?:?]
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2152) ~[?:?]
at org.elasticsearch.common.concurrent.CompletableContext.completeExceptionally(CompletableContext.java:57) ~[elasticsearch-core-7.9.2.jar:7.9.2]
at org.elasticsearch.transport.netty4.Netty4TcpChannel.lambda$addListener$0(Netty4TcpChannel.java:68) ~[transport-netty4-client-7.9.2.jar:7.9.2]
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:577) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:570) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:549) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:490) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:615) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:608) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117) ~[netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321) ~[netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337) ~[netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702) [netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615) [netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578) [netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-common-4.1.49.Final.jar:4.1.49.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.49.Final.jar:4.1.49.Final]
at java.lang.Thread.run(Thread.java:832) [?:?]
Caused by: java.io.IOException: Aucun chemin d'accès pour atteindre l'hôte cible: 10.11.10.166/10.11.10.166:9300
Caused by: java.io.IOException: Aucun chemin d'accès pour atteindre l'hôte cible
at sun.nio.ch.Net.pollConnect(Native Method) ~[?:?]
at sun.nio.ch.Net.pollConnectNow(Net.java:660) ~[?:?]
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:875) ~[?:?]
at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330) ~[netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334) ~[netty-transport-4.1.49.Final.jar:4.1.49.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702) ~[?:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615) ~[?:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578) ~[?:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[?:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[?:?]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[?:?]
at java.lang.Thread.run(Thread.java:832) ~[?:?]