Open specified port to join cluster

Hi everyone, my OS is centos7. Every time I have to close the firewall then I could join the node to the cluster, otherwise it would show the error:

[ES2] failed to send join request to master [{JWCDX3D}{JWCDX3DATsCmXjkrOjASNg}{bp2B0nx5Qy-TT8Hxj5F2kQ}{}{}{rack=ES3}], reason [RemoteTransportException[[JWCDX3D][][internal:discovery/zen/join]]; nested: ConnectTransportException[[ES2][] connect_timeout[30s]]; nested: IOException[No route to host:]; nested: IOException[No route to host]; ]

but, could I just open some port to make the node can join the cluster?
I have tried to open 9200 and 9300 port, but it still can't work.

thank you in advance !

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