This error is received because WHM is reporting the server does not have an A entry in DNS for your server’s hostname.

Be sure that your server has a fully qualified domain set as its hostname. It should be in the following format:

host.domain.com

An example of this would be:

server01.theplanet.com

Once you have determined that your server’s hostname is set correctly, you will need to make sure that your server’s /etc/hosts and /etc/sysconfig/network files are configured correctly with your servers hostname. Here are example files of what each of these should look like:

/etc/hosts:

70.87.6.11            server01.theplanet.com server01
127.0.0.1               localhost

/etc/sysconfig/network:

NETWORKING=yes
HOSTNAME=server01.theplanet.com

After that, be sure the DNS zone file for your server’s hostname domain exists in WHM. In the above example, there needs to be a DNS zone file for theplanet.com. In this zone file, there needs to be an A record for the server’s hostname. For the above example, the A entry that should exist in the DNS zone for theplanet.com should look like the following:

server01     14400   IN  A     70.87.6.11

Once you have added this entry to the DNS zone file, save the zone file, and you should no longer receive the missing hostname A entry message when logging into WHM.