To manage ESX 3.x/ESXi 3.5 hosts, you must configure vCenter Server to use a license server.

1

In vCenter Server, select Administration > vCenter Server Settings.

2

In the License Server text box, enter the port number and license server machine name, as in port@host.

For example: 27000@license-3.companyname.com

3

If you want the hosts and vCenter Server to use the same license server, select the Reconfigure ESX 3 hosts using license servers to use this server check box.

4

Click OK.