title: gethostbyaddr() has error 11001
body: <p>I'm writing simple program to communicate between smart devices and I receive 11001 when calling gethostbyaddr().  Both devices show they are connected to the same network, but from msdn document 11001 error is Host not found.  No such host is known.  Does anybody have any suggestion, thanks?  My code is below.</p>
  
  <pre><code>void InitializeSocket()
  {
      WORD socketVersion;
      WSADATA wsaData;
      SOCKADDR_IN serverInfo;
      int returnVal;
      LPHOSTENT remotHost;
  
      socketVersion = MAKEWORD(2,2);
      WSAStartup(socketVersion, &amp;wsaData);
  
      in_addr iaHost;
  
      //iaHost.s_addr = inet_addr("120.15.22.14");
      iaHost.S_un.S_un_b.s_b1 = 120;
      iaHost.S_un.S_un_b.s_b2 = 15;
      iaHost.S_un.S_un_b.s_b3 = 22;
      iaHost.S_un.S_un_b.s_b4 = 14;
      remotHost = gethostbyaddr((const char *)&amp;iaHost, sizeof(struct in_addr),
          AF_INET);
  
      if(iaHost.s_addr == INADDR_NONE)
      {
          MessageBox(NULL, TEXT("inet_addr has invalid address"),
              TEXT("inet_addr"), MB_OK);
          WSACleanup();
          closesocket(theSocket);
          return;
      }
  </code></pre>
  
  <p>&nbsp;</p>
  
  <pre><code>    if(!remotHost)
      {
          returnVal = WSAGetLastError();
          WSACleanup();
          closesocket(theSocket);
          return;
      }
  
      theSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    
      if(theSocket == INVALID_SOCKET)
      {
          returnVal = WSAGetLastError();
          WSACleanup();
          closesocket(theSocket);
          return;
      }
  
      serverInfo.sin_family = AF_INET;
      serverInfo.sin_addr = *((LPIN_ADDR)*remotHost-&gt;h_addr_list);
      serverInfo.sin_port = htons(8888);
  
      //Connect to the server
      returnVal = connect(theSocket, (LPSOCKADDR)&amp;serverInfo,
          sizeof(struct sockaddr));
  
      if(returnVal == SOCKET_ERROR)
      {
          returnVal = WSAGetLastError();
          WSACleanup();
          closesocket(theSocket);
          return;
      }
  }
  </code></pre>