Connecting socket in nonblocking mode into localhost continued by WSAEnumNetworkEvents doesn't work correctly.
Windows connect() function always return value SOCKET_ERROR, and WSAGetLastError return WSAEWOULDBLOCK, to continue with WSAEnumNetworkEvents configured by WSAAsyncSelect/WSAEventSelect, ReactOS WSA does not.
Simple client/server application is attached to test connecting.
Tested with ReactOS 20161013-r72963 in VirtualBox 5.0.20
(ReactOS seems sometimes (but not always) hang, when trying attached sample)