h1. ERF50-9294 Failed to save: failed to detect boot server

<pre>

ERF50-9294 [Foreman::WrappedException]: Unable to find IP address for 'foreman.home.lan' ([Resolv::ResolvError]: DNS result has no information for foreman.home.lan)

</pre>

<pre>

failed to detect boot server: ERF50-9294 [Foreman::WrappedException]: Unable to find IP address for 'capsule-server.satellite.example.com' ([SocketError]: getaddrinfo: Name or service not known)

</pre>

This happens when the hostname, set in the @tftp_servername@ option (TFTP Smart Proxy by default) has no valid DNS record via DNS servers set in SOA/NS record of the domain. Foreman resolves the hostname set in @tftp_servername@ to an IP address in order to ensure clients boots without any DNS requests.

By default, Foreman explicitly contacts DNS servers configured in the SOA therefore it ignores system-wide DNS setting (like @resolv.conf@, @/etc/hosts@, etc). This can lead to issues and may be unexpected behaviour for some administrators.

To change this the following options are available:

* Change the global setting @Administer -> Settings -> Provisoning ->  Query local nameservers@ via Web UI. Foreman will then query the locally configured resolver instead of the SOA/NS authorities when the setting is set. Note it will use that setting also for checking for DNS conflicts when creating new hosts.

* Or set the @tftp_servername@ configuration value to the server's IP address instead of the DNS name, directly in @/etc/foreman-proxy/settings.d/tftp.yml@, so Foreman won't need to resolve the hostname:

<pre>

[root@myproxy ~]# cat /etc/foreman-proxy/settings.d/tftp.yml 

---

:enabled: true

:tftproot: /var/lib/tftpboot/

:tftp_servername: 192.168.99.1

</pre>

* *restart @foreman-proxy@* process after changing by issuing @# service foreman-proxy restart@

* Foreman installer can set this automatically via @--foreman-proxy-tftp-servername@ option.

This error also appears when no Subnet was selected for a Host or a Hostgroup. Make sure there is a Subnet selected before submitting Host form.