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I have some vSPhere 4 standard licensed hosts in vCenter that had the key entered during install. I now want to change the licese key for these servers to use new Enteprrise Plus licenses that are controlled by vCenter, but I cant seem to do this. I have tried removing the keys but it won't let me, if I try to assign new unassigned keys they are greyed out within vCenter (they are fine to apply to new hosts).

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2 Answers 2

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You inherently must have a valid support contract with VMWare right now - have you asked them?

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This is the official procedure and should work:

In vCenter Home Screen -> Licensing.
Select one if your hosts, right click and select 'Change License Key'

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