After upgrading ES version, new node cannot join to the cluster

Elastic Stack Elasticsearch
1

After upgrading one node to ES 7.16.3, the new node cannot join the cluster, error from log :

[2022-01-26T22:33:34,365][DEBUG][o.e.d.PeerFinder         ] [ip-10-68-41-201.ec2.internal] address [[::1]:9304], node [null], requesting [false] connection failed
org.elasticsearch.transport.ConnectTransportException: [][[::1]:9304] connect_exception
        at org.elasticsearch.transport.TcpTransport$ChannelsConnectedListener.onFailure(TcpTransport.java:1047) ~[elasticsearch-7.16.3.jar:7.16.3]
        at org.elasticsearch.action.ActionListener.lambda$toBiConsumer$0(ActionListener.java:279) ~[elasticsearch-7.16.3.jar:7.16.3]
        at org.elasticsearch.core.CompletableContext.lambda$addListener$0(CompletableContext.java:31) ~[elasticsearch-core-7.16.3.jar:7.16.3]
        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:863) ~[?:?]
        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:841) ~[?:?]
        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[?:?]
        at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2162) ~[?:?]
        at org.elasticsearch.core.CompletableContext.completeExceptionally(CompletableContext.java:46) ~[elasticsearch-core-7.16.3.jar:7.16.3]
        at org.elasticsearch.transport.netty4.Netty4TcpChannel.lambda$addListener$0(Netty4TcpChannel.java:58) ~[?:?]

Enabled DEBUG level log by adding "logger.org.Elasticsearch.discovery: DEBUG" , and didn't see any other info except those "connection refused" exception.

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