# Firewall blocking icmp

**URL:** <https://discuss.elastic.co/t/firewall-blocking-icmp/54486>\
**Category:** Elasticsearch\
**Created:** [July 1, 2016, 1:48am UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486 "2016-07-01T01:48:40Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![yodog](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yodog/32/4822_2.png) [@yodog](https://discuss.elastic.co/u/yodog)\
**Post date:** [July 1, 2016, 1:48am UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486/1 "2016-07-01T01:48:40Z")

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i have my ELK cluster working fine, but i would like to get rid of some error messages found in the log file.

one of them is this one:

> 2016-06-30 22:21:25,815[INFO][discovery.zen] [elastic-node-202-174] master\_left [{elastic-node-30-161}{5WrNrcy-VygOw}{192.168.30.161}{192.168.30.161:9300}], reason [failed to ping, tried [3] times, each with maximum [30s] timeout]

i know that my company firewall is blocking icmp reply (we can't ping servers in different networks).

so, what config should i change make this message go away?

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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:** [July 1, 2016, 3:42am UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486/2 "2016-07-01T03:42:19Z")

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There's nothing you can do.

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**Author:** ![yodog](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yodog/32/4822_2.png) [@yodog](https://discuss.elastic.co/u/yodog)\
**Post date:** [July 1, 2016, 12:03pm UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486/3 "2016-07-01T12:03:19Z")

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can i disable ping?

or make it ping once every 6 hours?

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**Author:** ![ywelsch](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ywelsch/32/7751_2.png) [@ywelsch](https://discuss.elastic.co/u/ywelsch)\
**Post date:** [July 2, 2016, 11:03am UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486/4 "2016-07-02T11:03:00Z")

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The pinging done by ES is not based on ICMP but uses the same protocol as for all other kinds of inter-node communication (TCP). The log warning indicates that the master node was not reachable from this node for 90 seconds. Maybe the master was down for a while or there are connection issues in your network?

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**Author:** ![yodog](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yodog/32/4822_2.png) [@yodog](https://discuss.elastic.co/u/yodog)\
**Post date:** [July 2, 2016, 1:48pm UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486/5 "2016-07-02T13:48:35Z")

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i have 2 elk nodes on network 10.0.0.0 and 2 more on network 192.0.0.0  
i only see these lines when the communication is between networks.

when on the same, there are no problems.  
thats why i suspected it was the firewall blocking the ping.

now, since it is a tcp ping, and i know that i can telnet on ports 9200:9300 without any problem, i'm kind of lost...

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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:** [July 5, 2017, 10:38pm UTC](https://discuss.elastic.co/t/firewall-blocking-icmp/54486/6 "2017-07-05T22:38:50Z")

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