MS Windows套接字示例对我不起作用

我正在尝试运行此处概述的Windows套接字示例。

调试器中运行服务器代码，它在这里挂起accept（）调用：

#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(void) 
{
    WSADATA wsaData;
    int iResult;
    SOCKET ListenSocket = INVALID_SOCKET;
    SOCKET ClientSocket = INVALID_SOCKET;
    struct addrinfo *result = NULL;
    struct addrinfo hints;
    int iSendResult;
    char recvbuf[DEFAULT_BUFLEN];
    int recvbuflen = DEFAULT_BUFLEN;
    
    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed with error: %dn", iResult);
        return 1;
    }
    ZeroMemory(&hints, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;
    hints.ai_flags = AI_PASSIVE;
    // Resolve the server address and port
    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);
    if ( iResult != 0 ) {
        printf("getaddrinfo failed with error: %dn", iResult);
        WSACleanup();
        return 1;
    }
    // Create a SOCKET for the server to listen for client connections.
    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
    if (ListenSocket == INVALID_SOCKET) {
        printf("socket failed with error: %ldn", WSAGetLastError());
        freeaddrinfo(result);
        WSACleanup();
        return 1;
    }
    // Setup the TCP listening socket
    iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);
    if (iResult == SOCKET_ERROR) {
        printf("bind failed with error: %dn", WSAGetLastError());
        freeaddrinfo(result);
        closesocket(ListenSocket);
        WSACleanup();
        return 1;
    }
    freeaddrinfo(result);
    iResult = listen(ListenSocket, SOMAXCONN);
    if (iResult == SOCKET_ERROR) {
        printf("listen failed with error: %dn", WSAGetLastError());
        closesocket(ListenSocket);
        WSACleanup();
        return 1;
    }
    // Accept a client socket
    ClientSocket = accept(ListenSocket, NULL, NULL); // *** blocks here ***
    printf("accept completed!");
    return 0;
}

我最初希望这能立即成功完成（但 fbidwell 解释了为什么情况并非如此）。

由于我很确定大约有一百万人成功运行了它，所以我猜这不是代码，所以它是我环境中的东西。我运行的是Windows 7，VS Community 2015。关于我应该检查哪些设置以使这个看似简单的示例工作的任何建议？

编辑：正如Remy Lebeau在他的评论中指出的那样，WSAECOND对我来说是一个红鲱鱼。 Fbidwell的解释回答了我的问题。

我也在为 .NET 4.5.2 构建，如果有帮助的话。