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HNS_ENDPOINT_ALREADY_ATTACHED
HNS_ENDPOINT_ALREADY_ATTACHED is an HRESULT used by Windows Host Networking Service (HNS). It indicates that the requested attach operation duplicates an existing endpoint-to-switch attachment.
What to check for HNS_ENDPOINT_ALREADY_ATTACHED
- Inspect the endpoint state and existing vSwitch attachment before issuing another attach request.
- Make attach operations idempotent only after confirming the endpoint is attached to the correct switch.
- Resolve stale or incorrect attachments before moving the endpoint to another network.
For HNS_ENDPOINT_ALREADY_ATTACHED, Microsoft documentation on Windows container networking and HNS
Diagnostic interpretation of HNS_ENDPOINT_ALREADY_ATTACHED
HNS_ENDPOINT_ALREADY_ATTACHED has the HRESULT value 0xC03B0014. AllStat records the condition as “This endpoint is already attached to the switch.”. For HNS_ENDPOINT_ALREADY_ATTACHED, in practice, interpret that wording at the boundary owned by the Windows component or COM interface that returned the HRESULT, rather than treating the value as a generic Windows message.
Evidence to capture for HNS_ENDPOINT_ALREADY_ATTACHED
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0xC03B0014 value before a wrapper converts it to an exception or Boolean result.
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions HNS_ENDPOINT_ALREADY_ATTACHED or the hns / endpoint / already / attached operation.
- For HNS_ENDPOINT_ALREADY_ATTACHED, compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery for HNS_ENDPOINT_ALREADY_ATTACHED
Retry HNS_ENDPOINT_ALREADY_ATTACHED only when the owning API documents a transient state or after the condition described as “This endpoint is already attached to the switch.” has changed. For HNS_ENDPOINT_ALREADY_ATTACHED, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.
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