NTSTATUS 0xC00000BD (STATUS_DUPLICATE_NAME): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A legacy network name is already registered, so the conflicting endpoint and NetBIOS scope must be identified.

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STATUS_REMOTE_NOT_LISTENING	STATUS_BAD_NETWORK_PATH

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

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