http://technet.microsoft.com/en-us/library/jj612867.aspx

When deploying KMS on a Server 2012 R2, you may run into the error message saying nothing more but STATUS_SUCCESS.

The reason for this is that the KMS TCP Listening Port in the wizard, is by default set to 0, which is of course incorrect. Typing in the correct default value (1688) resolves the issue.