Winsock客户端在本地网络上发生错误11004

问题

我正在使用代码连接到HW终端上的Localhost作为服务器，并且可以连接。

然后，我尝试在另一台计算机上的本地网络上的另一台计算机上设置服务器。

WSAGETLASTERROR（）11004

怎么了？我只是不知道。

代码

Winsock客户的代码是：

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <string>
#include <iostream>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <cstdlib>
#include <cstdio>
#include <time.h>

// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "2112"
#define DEFAULT_PROTO SOCK_STREAM
int main()
{
    char Buffer[128];
    // default to localhost
    char *server_name = "localhost";
    unsigned short port = atoi(DEFAULT_PORT);
    int retval, loopflag = 0;
    int i, loopcount, maxloop = -1;
    unsigned int addr;
    int socket_type = DEFAULT_PROTO;
    struct sockaddr_in server;
    struct hostent *hp;
    int first = 1;
    WSADATA wsaData;
    SOCKET  conn_socket;
    //    srand(time(NULL));
    if ((retval = WSAStartup(0x202, &wsaData)) != 0)
    {
        fprintf(stderr, "Client: WSAStartup() failed: Error %dn", retval);
        WSACleanup();
        return -1;
    }
    else
        printf("Client: WSAStartup() is OK.n");
    printf("Defina o nome ou IP do servidor[default = localhost]:n");
    //    scanf( "%s" , Buffer );
    gets_s(Buffer);
    if (Buffer[0] != 0)
        server_name = Buffer;
    //    server_name = &Buffer;
    if (isalpha(server_name[0]))
    {   // server address is a name
        hp = gethostbyname(server_name);
    }
    else
    { // Convert nnn.nnn address to a usable one
        addr = inet_addr(server_name);
        hp = gethostbyaddr((char *)&addr, 4, AF_INET);
    }
    if (hp == NULL)
    {
        fprintf(stderr, "Client: Endereco IP nao identificado "%s": Error %dn", server_name, WSAGetLastError());
        WSACleanup();
        exit(1);
    }
    else
        printf("Client: gethostbyaddr() esta OK.n");
    memset(Buffer, 0, 128);
    printf("Defina a porta do server[default = 2112]:n");
    gets_s(Buffer);
    if (Buffer[0] != 0)
        port = atoi(Buffer);
    memset(&server, 0, sizeof(server));
    memcpy(&(server.sin_addr), hp->h_addr, hp->h_length);
    server.sin_family = hp->h_addrtype;
    server.sin_port = htons(port);
    conn_socket = socket(AF_INET, socket_type, 0); /* Open a socket */
    if (conn_socket <0)
    {
        fprintf(stderr, "Client: Erro ao abrir o socket: Error %dn", WSAGetLastError());
        WSACleanup();
        return -1;
    }
    else
        printf("Client: socket() esta OK.n");
    printf("Client: Cliente conectando com: %s.n", hp->h_name);
    conn_socket = socket(AF_INET, socket_type, 0); /* Open a socket */
    if (connect(conn_socket, (struct sockaddr*)&server, sizeof(server)) == SOCKET_ERROR)
    {
        fprintf(stderr, "Client: connect() falhou: Error %dn", WSAGetLastError());
        WSACleanup();
        return -1;
    }
    else
        printf("Client: connect() esta OK.n");
    loopcount = 0;
    return 0;
}

使用Visual Basic 2015进行编译，使用：Project > Properties > Configuration Properties > C/C++ > Preprocessor > Preprocessor Definitions

_WINSOCK_DEPRECATED_NO_WARNINGS
_CRT_SECURE_NO_WARNINGS

测试

• 使用telnet和ping在使用大力神HW终端创建的其他服务器上工作。
• 使用大力神HW终端作为计算机A上的客户端和计算机B上的服务器也有效，所以我认为它是我的代码。
• 使用nmap -p 2112 192.168.1.134

结果是：

Nmap scan report for 192.168.1.134
Host is up (0.00s latency).

PORT     STATE SERVICE
2112/tcp open  kip
MAC Address: 00:19:BB:F7:48:29 (Hewlett Packard)

Nmap done: 1 IP address (1 host up) scanned in 3.31 seconds