# Host(s) Unable to Connect to Management Plane With "Error: getaddrinfo ENOTFOUND

## Problem

* Host(s) are unable to remain online from the Management Plane's perspective.
* The following errors are present at */var/log/pf9/comms/comms.log.*

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```none
[122] [ERROR] sni-http-v1-8158-1 - Server socket for client 87 error: { [Error: getaddrinfo ENOTFOUND customer.platform9.net customer.platform9.net:443]  code: 'ENOTFOUND',  errno: 'ENOTFOUND',  syscall: 'getaddrinfo',  hostname: 'customer.platform9.net',  host: 'customer.platform9.net',  port: 443 }Error: getaddrinfo ENOTFOUND customer.platform9.net customer.platform9.net:443    at errnoException (dns.js:27:10)    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:78:26)
```

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## Environment

* Platform9 Managed OpenStack - All Versions

## Cause

* The hosts' DNS servers are unable to resolve the Management Plane URL.
* If you’re running Ubuntu 16.10 or later, your DNS resolution will be managed by the ***systemd-resolved*** service. If this service is restarted any changes applied in the file */etc/resolv.conf* which is a symlink to */run/systemd/resolve/resolv.conf* will be lost.

## Resolution

1. It will be necessary to contact your DNS provider or internal network team that maintains your environments' DNS server(s) in order to troubleshoot the root cause.
2. If the DNS resolution is managed by ***systemd-resolved*** service in Ubuntu 16.10 or later, You can disable the service and create a regular */etc/resolv.conf* file.


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