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STATUS_PROTOCOL_NOT_SUPPORTED
The local machine does not have the requested protocol installed
This transport status means the requested protocol is unavailable on the local system. It is different from a remote protocol rejection or a blocked firewall rule.
Record the requested protocol and the endpoint or provider that rejected it. This is a capability result; verify stack and provider support before looking for packet-filtering causes.
What to inspect
- Identify the protocol number or provider requested.
- Check installed network components and bindings.
- Separate missing local protocol support from network reachability.
References for STATUS_PROTOCOL_NOT_SUPPORTED
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