What does Windows error code 10046 (WSAEPFNOSUPPORT) mean?

WSAEPFNOSUPPORT

WSAEPFNOSUPPORT concerns the protocol family selected for a socket operation. It is close to WSAEAFNOSUPPORT, but the distinction is historical: Microsoft documents the two as slightly different while also noting that they are interchangeable in most Winsock cases.

Where the mismatch occurs

A socket is created with a family, type, and optional protocol. Internet applications normally use AF_INET or AF_INET6. A provider must exist that can implement the requested combination. A family constant copied from another platform, a provider catalog problem, or a family/protocol pairing that the selected provider does not implement can all make the request impossible before any packet is sent.

What to compare

• The af, type, and protocol arguments passed to socket or WSASocket.
• The family stored in each sockaddr later passed to the socket.
• The protocol entries returned by WSAEnumProtocols when provider availability is in doubt.

This is not a remote-host refusal. The failure is about local protocol-family support or selection.

Microsoft: Winsock error codes · Microsoft: socket · IETF: Basic IPv6 Socket Interface Extensions

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