# Firewalld prevents ES nodes from communicating **URL:** \ **Category:** Elasticsearch\ **Created:** [February 19, 2016, 8:52am UTC](https://discuss.elastic.co/t/firewalld-prevents-es-nodes-from-communicating/42219 "2016-02-19T08:52:46Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Python\_Coder](https://avatars.discourse-cdn.com/v4/letter/p/aeb1de/32.png) [@Python\_Coder](https://discuss.elastic.co/u/Python_Coder)\ **Post date:** [February 19, 2016, 8:52am UTC](https://discuss.elastic.co/t/firewalld-prevents-es-nodes-from-communicating/42219/1 "2016-02-19T08:52:46Z")
Hello, I have 2 servers with CENTOS 7 installed, i have configured ElasticSearch cluster accordingly but after starting the ES instance with firewalld enabled, both nodes couldn't communicate with each other (unicast), however, when i disabled the firewalld service, everything was good. Note: I have opened both port 9200 and 9300 on firewalld. Any hints? Thanks ---
**Author:** ![ebuildy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ebuildy/32/6070_2.png) [@ebuildy](https://discuss.elastic.co/u/ebuildy)\ **Post date:** [February 19, 2016, 1:13pm UTC](https://discuss.elastic.co/t/firewalld-prevents-es-nodes-from-communicating/42219/2 "2016-02-19T13:13:20Z")
Are sure 100% sure that ports 9200/9300 are available between both machines? ---
**Author:** ![Python\_Coder](https://avatars.discourse-cdn.com/v4/letter/p/aeb1de/32.png) [@Python\_Coder](https://discuss.elastic.co/u/Python_Coder)\ **Post date:** [February 19, 2016, 2:17pm UTC](https://discuss.elastic.co/t/firewalld-prevents-es-nodes-from-communicating/42219/3 "2016-02-19T14:17:53Z")
Yes, both ports are opened on both firewalls ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 11:14pm UTC](https://discuss.elastic.co/t/firewalld-prevents-es-nodes-from-communicating/42219/4 "2017-07-05T23:14:54Z")