# Cross Cluster Search - port 9300 - need to open flow in bidirectional way

**URL:** <https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168>\
**Category:** Elasticsearch\
**Tags:** ccs-cross-cluster-search\
**Created:** [May 19, 2022, 10:39am UTC](https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168 "2022-05-19T10:39:32Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![federica.forti](https://avatars.discourse-cdn.com/v4/letter/f/f17d59/32.png) [@federica.forti](https://discuss.elastic.co/u/federica.forti)\
**Post date:** [May 19, 2022, 10:39am UTC](https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168/1 "2022-05-19T10:39:32Z")

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Hi,

i'd like to use Cross Cluster Search between two clusters (ES version: 5.6).  
For example i'd like to see data from cluster A to cluster B; I'd like to know if there is the need to open the flow in bidirectional way on port 9300 or if it is enough to open the flow only from cluster A to cluster B.

Thanks a lot.  
Federica Forti | Elastic Certified Consultant

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [May 19, 2022, 12:35pm UTC](https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168/2 "2022-05-19T12:35:39Z")

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You really need to upgrade first. As a matter of urgency.

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**Author:** ![federica.forti](https://avatars.discourse-cdn.com/v4/letter/f/f17d59/32.png) [@federica.forti](https://discuss.elastic.co/u/federica.forti)\
**Post date:** [May 19, 2022, 12:38pm UTC](https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168/3 "2022-05-19T12:38:12Z")

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> [@dadoonet](#):
>
> ou really need to upgrade first. As a matter of urgency.

Unfortunatly this is not possible at the moment.

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [May 19, 2022, 11:03pm UTC](https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168/4 "2022-05-19T23:03:02Z")

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Welcome to our community! 😃

5.X is very much past [EOL](https://www.elastic.co/support/eol) and you need to upgrade very urgently. 5.0 was released nearly 6 years ago.

Yes, it needs to be bidirectional.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 16, 2022, 11:03pm UTC](https://discuss.elastic.co/t/cross-cluster-search-port-9300-need-to-open-flow-in-bidirectional-way/305168/5 "2022-06-16T23:03:09Z")

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