mfc网络编程有关问题，向本机端口发送UDP数据报为什么收不到呢

mfc网络编程问题，向本机端口发送UDP数据报为什么收不到呢？
用UDP数据报发送数据给本机，数据可以发出去，但是服务端（本机）却接收不到任何数据，刚接触网络，请指教！
服务器端：

SOCKET  server_socket_udp;

sockaddr_in server_address_udp,from_address_udp;

char server_data[20]="你好";

server_socket_udp=socket(AF_INET,SOCK_DGRAM,0);

server_address_udp.sin_family=AF_INET;

server_address_udp.sin_port=htons(6012);//6000转化为网络字节顺序

server_address_udp.sin_addr.S_un.S_addr=htons(INADDR_ANY);//将long转化为网络字节顺序 inet_addr("127.0.0.1");

if(SOCKET_ERROR==bind(server_socket_udp,(sockaddr *)(&server_address_udp),sizeof(server_address_udp)))

{

   CString str;

   str.Format("绑定Socket失败,错误代码：%d",GetLastError());

   MessageBox(str);

   closesocket(server_socket_udp);

   return;

}

int len=sizeof(from_address_udp);

recvfrom(server_socket_udp,server_data,20,0,(sockaddr *)&(from_address_udp),&len);//但是接收不到数据，程序停在这里

客户端：

SOCKET consumer_udp;

sockaddr_in  server_address_udp1;

char consumer_data[20];

consumer_udp=socket(AF_INET,SOCK_DGRAM,0);

server_address_udp1.sin_family=AF_INET;

server_address_udp1.sin_port=htons(6012);//199186转化为网络字节顺序

server_address_udp1.sin_addr.S_un.S_addr=htons(INADDR_BROADCAST);

sendto(consumer_udp,consumer_data,20,0,(sockaddr *)&server_address_udp1,sizeof(sockaddr));//可以发送成功

------解决方案--------------------
http://www.vckbase.com/index.php/wv/657