WSAEPROTONOSUPPORT - Error 10043

Question/Problem: Protocol not supported.

Answer/Solution: The protocol has not been configured into the system, or no implementation for it exists. So, for example, if a Winsock implementation doesn't support SOCK_RAW with IPPROTO_IP (or any other protocol), then the socket call would fail with WSAEPROTONOSUPPORT (however, if it doesn't support SOCK_RAW at all, you should expect WSAESOCKTNOSUPPORT).