Same SID Issue When Joining Domain

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Description:

I once had an issue joining a domain server to the domain in my test lab. It said something about ‘SID already exist’. This makes sense because I had cloned the VM from my domain controller prior to adding the AD Role. In order to fix, you just need to change the SID. There is a stale program called ‘ChangeSID’ that I found, but I think it would be much easier to generalize the image and try again. This of course worked:

To Resolve:

  1. Run the following from Admin CMD and try to join the domain again after reboot:
%WINDIR%\system32\sysprep\sysprep.exe /generalize /shutdown /oobe /mode:vm