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}{192.168.0.139}{192.168.0.139:9300}{rack=ES3}], reason [RemoteTransportException[[JWCDX3D][192.168.0.139:9300][internal:discovery/zen/join]]; nested: ConnectTransportException[[ES2][192.168.0.243:9300] connect_timeout[30s]]; nested: IOException[No route to host: 192.168.0.243/192.168.0.243:9300]; 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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