Is the host's Service Console on the same subnet as the License Server?
Can you telnet to the License Server on ports 27000 and 27010?
Co-Author of VMware ESX Essentials in the Virtual Data Center
(ISBN:1420070274) from Auerbach
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Yes and yes.
i had same problem solve after firewall opened. please try to stop firewall and check but it is not recommanded to stop it only for test and check host name of license server or put manaul entry in /etc/hosts file on esx server
VMware Support's solution was to open the VMware License Server Tools on the license server and stop and restart the license server with the "Force Server Shutdown" box checked and then disconnect the problem host from Virtual Center and reconnect it. This will cause all hosts to become temporarily unlicensed, but they should all pick up their new licenses within a few seconds.