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ERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATION
The domain SID is identical to the local workstation SID because the installation was cloned incorrectly.
ERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATION is Windows status 8644 (0x000021C4) associated with a domain join where the domain SID equals the local machine SID. The system meaning is “The domain SID is identical to the local workstation SID because the installation was cloned incorrectly.”
Likely impact: Joining with identical SIDs would undermine security-principal identity and must not be forced.
Typical causes
- the OS image was cloned without Sysprep.
- a snapshot duplicated machine identity.
- unsupported imaging copied local security state.
- the target is an incorrectly cloned domain environment.
Troubleshooting steps
- Verify that the workstation has a unique machine SID distinct from the target domain SID.
- Collect local machine SID and target domain SID.
Useful evidence
- Collect Sysprep logs.
- Collect join request and contacted DC.
Recovery and retry
Redeploy or generalize the machine with Sysprep so a new SID is generated, then perform a fresh domain join.
Related errors
ERROR_DUPLICATE_SERVICE_NAME and machine-account conflicts concern directory names; this code identifies an impossible SID identity collision
Example
A VM template was captured before generalization. Rebuilding the template with Sysprep gives each clone a unique SID and domain join succeeds.
References
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