# 'Unable to revive connection' errors when running ES in Docker container
**URL:** https://discuss.elastic.co/t/unable-to-revive-connection-errors-when-running-es-in-docker-container/62374
**Category:** Elasticsearch
**Created:** [October 6, 2016, 12:06pm UTC](https://discuss.elastic.co/t/unable-to-revive-connection-errors-when-running-es-in-docker-container/62374 "2016-10-06T12:06:22Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Marco\_Berndsen](https://discuss.elastic.co/u/Marco_Berndsen)
#### Post date: [October 6, 2016, 12:06pm UTC](https://discuss.elastic.co/t/unable-to-revive-connection-errors-when-running-es-in-docker-container/62374/1 "2016-10-06T12:06:22Z")
I'm creating an search application, using Docker containers and keep getting 'Unable to revive connection' and 'No living connections' errors. The setup I'm using:
- ES 2.4 image in Docker container
- elasticsearch.js based front-end in nginx container
- ubuntu container for test pruposes
- all containers in a user-defined network within docker
I feed ES using curl from the ubuntu container with some test data. Works well: data is indexed and can be queried. All from the ubuntu container. When I try to query from my js frontend, however, I get the above error messages. Running it on my Mac, works all perfect. The errors only appear when communication is between containers.
This is what I already found out, trying to solve the issue:
- I (probably?) have to turn on CORS (see [Elastic Search enable CORS](http://blog.codingtimes.com/2016/06/12/elastic-search-enable-cors/)). So I did.
- I have to something similar in my nginx configuration (see [Wide open nginx Cors configuration](https://michielkalkman.com/snippets/nginx-cors-open-configuration.html)). So I also did.
Still no effect. Has anyone a clue?
Thanks!
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 10:14pm UTC](https://discuss.elastic.co/t/unable-to-revive-connection-errors-when-running-es-in-docker-container/62374/2 "2017-07-05T22:14:20Z")