Quite often if an operating system clone has failed you will be presented with the following message when attempting to join a server using a DC that was cloned improperly:
"The domain join cannot be completed because the SID of the domain you are attempting to join was identical to the sid of this machine."
We can generalize the operating system to resolve this issue by launching sysprep and selecting the "Generalize" option and then restart into OOBE (Out of Box Experience.):
C:\Windows\System32\Sysprep\sysprep.exe
Upon getting back into the OS again we can use the utility called
psgetid provided by sysinternals to confirm that we have been allocated a new SID.
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