ERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATION 0x800721C4

Error code 8644 · HRESULT 0x800721C4

WINDOWS

The domain join cannot be completed because the SID of the domain you attempted to join was identical to the SID of this machine. This is a symptom of an improperly cloned operating system install. You should run sysprep on this machine in order to generate a new machine SID. Please see http://go.microsoft.com/fwlink/?LinkId=168895 for more information.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATION is a Windows error code (system error 8644, returned as HRESULT 0x800721C4) reported by Windows. Its official message is: “The domain join cannot be completed because the SID of the domain you attempted to join was identical to the SID of this machine. This is a symptom of an improperly cloned operating system install. You should run sysprep on this machine in order to generate a new machine SID. Please see http://go.microsoft.com/fwlink/?LinkId=168895 for more information.”

How to fix ERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATION

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_DOMAIN_CONTROLLER_NOT_FOUNDERROR_DOMAIN_TRUST_INCONSISTENTERROR_DOMAIN_LIMIT_EXCEEDEDERROR_DOMAIN_EXISTSERROR_DS_LOW_ADLDS_FFLERROR_DS_UNDELETE_SAM_VALIDATION_FAILEDERROR_DS_HIGH_DSA_VERSION

Source: Microsoft WinError.h

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