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ERROR_NDIS_MULTICAST_EXISTS
ERROR_NDIS_MULTICAST_EXISTS The request attempted to add a multicast address that is already present in the interface list. This is generally an idempotency or state-tracking problem in the caller rather than an adapter failure.
What to check
- Read the current multicast state before adding an address.
- Make add and remove operations idempotent in the protocol, filter, or management component.
- Check for concurrent configuration paths that can submit the same multicast membership twice.
Microsoft: Handling OID requests in a miniport adapter
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