Error 0xC004C020 In Windows 2008 r2

0xC004C020 Error:

0xC004C020 error means the Activation key has exceeded its limit. If you have activated the server once, it is expected behavior.

1. Run the command “slui 4” from the Elevated Command Prompt.
2. Please choose the nearest location where you live, click next.
3. Call the Activation Department with the telephone number provided by the last step.
4. Provided them with the Installation ID and they generate a corresponding Confirmation ID.
5. Enter the Confirmation ID.

You will be able to activate the Windows Server 2008 successfully, and remove that pesky error 0xC004C02.

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