# Can't connect coordinator\_host

**URL:** <https://discuss.elastic.co/t/cant-connect-coordinator-host/109312>\
**Category:** Elastic Cloud Enterprise (ECE)\
**Created:** [November 28, 2017, 6:06am UTC](https://discuss.elastic.co/t/cant-connect-coordinator-host/109312 "2017-11-28T06:06:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![syed](https://avatars.discourse-cdn.com/v4/letter/s/a88e57/32.png) [@syed](https://discuss.elastic.co/u/syed)\
**Post date:** [November 28, 2017, 6:06am UTC](https://discuss.elastic.co/t/cant-connect-coordinator-host/109312/1 "2017-11-28T06:06:50Z")

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Please find the below error while adding the 2nd node to the elastic cloud enterprise:

```auto
Elastic Cloud Enterprise Installer

Install Elastic Cloud Enterprise on this host to add its resources to an existing installation.
After installation is complete, the host becomes a runner that you can assign a role to in the Cloud UI.
To learn more about the options you can specify, see the documentation.

```

-- Verifying Prerequisites --  
Checking host storage path... PASSED  
Checking docker version... PASSED  
Checking internal ip connectivity... PASSED  
Checking coordinator connectivity... FAILED  
Can't connect COORDINATOR\_HOST [172.16.42.155:2112]: Host is unreachable  
Checking OS settings... PASSED  
Checking OS kernel version... PASSED  
Checking Minimum required memory... PASSED  
Checking Kernel cgroup.memory setting... PASSED

- OS setting 'cgroup.memory' should be set to cgroup.memory=nokmem

```auto
Errors have caused Elastic Cloud Enterprise installation to fail
Some of the prerequisites failed: [coordinator connectivity], please fix before continuing

```

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<div class="post-metadata">

**Author:** ![uricohen](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/uricohen/32/9776_2.png) [@uricohen](https://discuss.elastic.co/u/uricohen)\
**Post date:** [November 28, 2017, 8:59am UTC](https://discuss.elastic.co/t/cant-connect-coordinator-host/109312/2 "2017-11-28T08:59:54Z")

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Hi Syed

Which Docker version are you using? if 1.12, you should follow the  
directions in our prerequisities and disable kmem accounting at OS boot  
time. See here for more details:  
[https://www.elastic.co/guide/en/cloud-enterprise/1.1/ece-prereqs.html#ece-prereqs-software](https://www.elastic.co/guide/en/cloud-enterprise/1.1/ece-prereqs.html#ece-prereqs-software)  
.

HTH  
Uri

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 12, 2017, 8:59am UTC](https://discuss.elastic.co/t/cant-connect-coordinator-host/109312/3 "2017-12-12T08:59:57Z")

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