Available ports on a data node?

What ports / access need to be open on a data node for it to join a cluster?

Im attempting to join a data node to a master but am getting timeouts. From the data node I can get the 'all is well' curl response from port 9200 but the join doesn't seem to work.

From the master node I don't know what to probe on the data node to look for blocks.

Could you please provide elasticsearch.log on master and data node?

Elasticsearch nodes communicate internally on the 9300 port so that has to be open.

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