The hostname host name resolves to the following IP address: IP_address. The DNS lookup by IP address failed.
The host name resolved to the IP address using DNS, but the DNS lookup by IP address failed.
If you are running the product on a standalone host and do not intend to use this host in a multiple-host environment, you can ignore this message. If you are not using DNS, you can ignore this message. If you are running the product in a multiple-host environment, before you use this host in the product, correct the issues with the DNS.