Our KMS server had been running without issue for months until recently when I tried to activate another Windows Server 2008 R2 client (already 30+ in the environment) and it just wouldn’t activate, giving the error “”Error: 0xC004F074 The Software Licensing Service reported that the computer could not be activated. The Key Management Service (KMS) [...]

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Open the command prompt and navigate to %windir%\System32 directory slmgr.vbs -cpky (this clears the KMS entry you may have) slmgr.vbs -upk (this removes any product key installed) slmgr.vbs -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx (where the x’s are the new product key you want to use) slmgr.vbs -ato (this activates the server) Type slmgr.vbs for further options….

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