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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 it, Microsoft documentation on Windows container networking and HNS
Diagnostic interpretation
This result has the HRESULT value 0xC03B0014. AllStat records the condition as “This endpoint is already attached to the switch.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the hns / endpoint / already / attached operation.
- compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery
” has changed.
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