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STATUS_DUPLICATE_NAME
A network name is already registered by another endpoint
The status comes from legacy network naming, especially NetBIOS and LAN Manager environments, where a computer or service name must be uniquely registered within its scope. A duplicate can be caused by cloned machines, stale registrations, multihomed systems, or two devices configured with the same name.
Modern DNS reachability does not eliminate the conflict if an application still depends on NetBIOS names or the Browser protocol. Identify the exact name including any NetBIOS suffix, the interface on which it was registered, and the endpoint currently answering for it before renaming systems.
What to inspect
- Capture the conflicting name, suffix, address, and interface.
- Check for cloned host names and stale NetBIOS registrations.
- Confirm whether the workload still requires legacy NetBIOS discovery.
References
- Microsoft Open Specifications: CIFS Browser glossary
- Microsoft Open Specifications: CIFS Browser Protocol overview
- Microsoft: SMBv1 is not installed by default
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