# Available ports on a data node?
**URL:** https://discuss.elastic.co/t/available-ports-on-a-data-node/197238
**Category:** Elasticsearch
**Created:** [August 28, 2019, 11:24pm UTC](https://discuss.elastic.co/t/available-ports-on-a-data-node/197238 "2019-08-28T23:24:04Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@ethrbunny](https://discuss.elastic.co/u/ethrbunny)
#### Post date: [August 28, 2019, 11:24pm UTC](https://discuss.elastic.co/t/available-ports-on-a-data-node/197238/1 "2019-08-28T23:24:04Z")
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.
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### Author:  [@wangqinghuan](https://discuss.elastic.co/u/wangqinghuan)
#### Post date: [August 29, 2019, 1:58am UTC](https://discuss.elastic.co/t/available-ports-on-a-data-node/197238/2 "2019-08-29T01:58:59Z")
Could you please provide elasticsearch.log on master and data node?
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [August 29, 2019, 4:11am UTC](https://discuss.elastic.co/t/available-ports-on-a-data-node/197238/3 "2019-08-29T04:11:39Z")
Elasticsearch nodes communicate internally on the 9300 port so that has to be open.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 26, 2019, 4:11am UTC](https://discuss.elastic.co/t/available-ports-on-a-data-node/197238/4 "2019-09-26T04:11:42Z")
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