# MasterNotDiscoveredException

**URL:** <https://discuss.elastic.co/t/masternotdiscoveredexception/5171>\
**Category:** Elasticsearch\
**Created:** [August 16, 2011, 11:34am UTC](https://discuss.elastic.co/t/masternotdiscoveredexception/5171 "2011-08-16T11:34:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lfc1989](https://avatars.discourse-cdn.com/v4/letter/l/43a26b/32.png) [@lfc1989](https://discuss.elastic.co/u/lfc1989)\
**Post date:** [August 16, 2011, 11:34am UTC](https://discuss.elastic.co/t/masternotdiscoveredexception/5171/1 "2011-08-16T11:34:30Z")

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I have been working on a web application for about a month now that uses ElasticSearch. I'm now starting to get issues with connecting to a ES node (my knowledge around ES is not great so forgive me if the terminology is wrong)

An error message I get is: failed to send ping to [[#zen\_unicast\_4#][inet[/xxx.xx.xxx.xxx:9301]]]

I then get a MasterNotDiscoveredException and the entire thing breaks down and doesn't let me connect to the ES server.

Could anyone please guide me on what could be wrong?

Many thanks.

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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 6, 2017, 3:56am UTC](https://discuss.elastic.co/t/masternotdiscoveredexception/5171/2 "2017-07-06T03:56:50Z")

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