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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.
Microsoft documentation on Windows container networking and HNS
Diagnostic discriminator: Inspect the endpoint’s current switch/network attachment before issuing another attach. If it is already attached to the intended target, make the operation idempotent; if attached elsewhere, repair that stale relationship first.
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