What does HRESULT 0xC03B000C (HNS_INVALID_ENDPOINT) mean?

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HNS_INVALID_ENDPOINT: The supplied Host Networking Service endpoint configuration is invalid or incomplete.

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HNS_INVALID_NETWORK_TYPE	HNS_INVALID_POLICY

HNS_INVALID_ENDPOINT

HNS_INVALID_ENDPOINT is an HRESULT used by Windows Host Networking Service (HNS). It indicates that the endpoint request has missing or inconsistent IP, network, MAC, or policy data.

What to check for HNS_INVALID_ENDPOINT

Validate the endpoint JSON and confirm that all referenced networks and subnets already exist.
Check IP address, prefix, gateway, DNS, and MAC values against the target network configuration.
Create the endpoint only once the container and network lifecycle state are consistent.

Microsoft documentation on Windows container networking and HNS

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