# Error: cannot open display: :99 **URL:** \ **Category:** Build Environment\ **Created:** [July 26, 2017, 1:17pm UTC](https://discuss.circleci.com/t/error-cannot-open-display-99/14791 "2017-07-26T13:17:52Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![allartk](https://avatars.discourse-cdn.com/v4/letter/a/ebca7d/32.png) [@allartk](https://discuss.circleci.com/u/allartk)\ **Post date:** [July 26, 2017, 1:17pm UTC](https://discuss.circleci.com/t/error-cannot-open-display-99/14791/1 "2017-07-26T13:17:52Z")
We are testing out circleci. Until this afternoon (CET) all was shiny and planned to add containers. However: without changing the image much, all tests fail now. 26 07 2017 13:07:27.070:ERROR [launcher]: Firefox stdout: 26 07 2017 13:07:27.070:ERROR [launcher]: Firefox stderr: Unable to init server: Could not connect: Connection refused Error: cannot open display: :99 I changed the image to own based on circleci, but no change. It is based on circleci/php:7.0-cli-node-browsers Karma is the test runner that tries to open firefox. ---
**Author:** ![allartk](https://avatars.discourse-cdn.com/v4/letter/a/ebca7d/32.png) [@allartk](https://discuss.circleci.com/u/allartk)\ **Post date:** [August 4, 2017, 11:53am UTC](https://discuss.circleci.com/t/error-cannot-open-display-99/14791/2 "2017-08-04T11:53:59Z")
See also [Default Xvfb stopped working](https://discuss.circleci.com/t/default-xvfb-stopped-working/14800/4) It is resolved now. ---
**Author:** ![system](https://global.discourse-cdn.com/circleci/original/3X/5/1/511608acda8e85906e15909b57bd0a46c1dbe291.png) [@system](https://discuss.circleci.com/u/system)\ **Post date:** [June 18, 2018, 11:32am UTC](https://discuss.circleci.com/t/error-cannot-open-display-99/14791/3 "2018-06-18T11:32:40Z")
Closed on June 18, 2018, 11:32am UTC