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Unable to power on VMs due to expired ESX license

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I knew ESX alone is free. Although I always get “License Expired” warning at the right bottom of my vSphere, as long as I can still use it, I never thought about fix it. Today I rebooted it after enabled a feature, and found I can no longer power up my VMs, due to license issue. I didn’t have a chance to take any screen dump.

I followed these two posts from https://communities.vmware.com/message/2305075 and solved this problem, once for all. Thanks for sharing!

Once you login to download the product, you are provided with a licence key - see image below. 
VMware-Hypervisor.png
"Open vSphere client, then select host icon and open Configuration tab.
Under Software list, open Licensed Features and at the upper right corner, click on Edit…
Select “Assign a new license key to this host”, then insert your own free license key provided you by VMWare site.“