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WSAENOPROTOOPT
WSAENOPROTOOPT means that getsockopt or setsockopt was asked for an option name or protocol level the selected provider does not support. It is not a response from the network and does not by itself indicate that the socket is disconnected.
Why it occurs
Socket options are scoped by level: generic SOL_SOCKET options differ from TCP-, IP-, IPv6-, or provider-specific options. An option may be valid on another operating system, another address family, a different socket type, or a newer provider, yet still be unavailable to this socket. Confusing an option's value type or size can produce related argument errors, so preserve both the option identity and buffer shape in logs.
Practical diagnosis
- Log the API, level, option name, value size, address family, socket type, and provider.
- Verify the option against the exact Windows SDK and provider documentation rather than testing unrelated options until one succeeds.
- When portability is required, treat optional tuning features as capability checks, not mandatory startup steps.
Microsoft: Winsock error codes · Microsoft: provider-bound sockets · The Open Group: socket options
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