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HNS_PORT_ALREADY_EXISTS
HNS_PORT_ALREADY_EXISTS is an HRESULT used by Windows Host Networking Service (HNS). It indicates that HNS attempted to create a port that is already associated with the target switch.
What to check for HNS_PORT_ALREADY_EXISTS
- Verify whether the endpoint is already attached to the expected virtual switch.
- Check for a previous incomplete create operation before creating another port.
- Use the existing port only after confirming that it belongs to the intended endpoint.
Microsoft documentation on Windows container networking and HNS
Diagnostic discriminator: Inspect the ports already associated with the target virtual switch before creation. This result means the requested port identity is already present, not that the switch itself is missing.
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