My ESXi disconnects from my vCenter

Hello,

I have one ESXi 6.0U3 (5050593) and my vCenter is 6.0U3h (9313458)

If I connect my ESXi to my vCenter using the IP everything it´s ok... But if I connect my ESXi to my vCenter using the hostname (not FQDN) apparently connects but after more or less 60 second disconnects from the vCenter.

What´s the issue?

Thanks