Vcenter Server service installation prompt could not resolve this fully qualified domain name problem

The first two days of discussion with colleagues, mention the following figure why there is a hint, in the end which functions can not work, I see the "Vsphere Installation and Setup Guide", which said some, personally feel that the hint may affect the DNS related work, regardless of the impact, first destroyed its "yellow triangle."

1 Login ESXI 5 server, enter username password, select "Configure Management Network", select "DNS Configuration", Hostname line complete FQDN (fully qualified domain name), such as ESXI1.xx.com

2 Connect to the DC domain control server, select DNS forward zone, and create a forward host record

3 Select the DNS reverse zone and create a reverse zone