c++ socket programming: bind() fails - c++

Question

I'm trying to construct a simple UDP network program in C++ to establish a real-time data communication platform between two computers in my company.
The below code is for Server (receiver), and I successfully tested the network self-communication (IP='127.0.0.1').
However, if I change the IP number corresponding to another computer (147.47.42.50), I face a binding failure error.
When I type 'ping' in cmd, it successfully returns responses.
Is there any incorrect logic in my program? and is there any way to debug this problem?
#include <stdio.h>
#include <iostream>
#include <winsock2.h>
#include <windows.h>
#pragma comment (lib,"ws2_32.lib")
#define BUFFER_SIZE 1024
using namespace std;
void main(void)
{
WSADATA wsaData;
SOCKET ServerSocket;
SOCKADDR_IN ServerInfo;
SOCKADDR_IN FromClient;
int FromClient_Size;
int Recv_Size;
int Send_Size;
int Count;
char Buffer[BUFFER_SIZE];
short ServerPort = 6000;
if (WSAStartup(0x202, &wsaData) == SOCKET_ERROR)
{
cout << "WinSock initialization fail. " << endl;
WSACleanup();
}
memset(&ServerInfo, 0, sizeof(ServerInfo));
memset(&FromClient, 0, sizeof(FromClient));
memset(Buffer, 0, BUFFER_SIZE);
ServerInfo.sin_family = AF_INET;
ServerInfo.sin_addr.s_addr = inet_addr("147.47.42.50");
ServerInfo.sin_port = htons(ServerPort);
ServerSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (ServerSocket == INVALID_SOCKET) //
{
cout << "Cannot create socket." << endl;
closesocket(ServerSocket);
WSACleanup();
exit(0);
}
if (bind(ServerSocket, (struct sockaddr*)&ServerInfo,
sizeof(struct sockaddr)) == SOCKET_ERROR)
{
cout << "Bind fail." << endl;
closesocket(ServerSocket);
WSACleanup();
exit(0);
}
while (1)
{
FromClient_Size = sizeof(FromClient);
Recv_Size = recvfrom(ServerSocket, Buffer, BUFFER_SIZE, 0,
(struct sockaddr*)&FromClient, &FromClient_Size);
if (Recv_Size < 0)
{
cout << "recvfrom() error!" << endl;
exit(0);
}
cout << "Receive! client IP: " << inet_ntoa(FromClient.sin_addr) << endl;
cout << "Data: " << Buffer << endl;
}
closesocket(ServerSocket);
WSACleanup();
}