FTP-сервер. Клент не отвечает серверу.

#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <process.h>
#include <stdio.h>
#include "work.h"

DWORD dwFtpPort = 0;
char* szMainFile = "c:\\file.txt";
int i;
int  iLen = 0;
struct sockaddr_in clientData;

void FTPSendFile(SOCKET sock, struct sockaddr_in *clientData)
{
    SOCKET dataSock = 0;
    FILE  *fp;
    BYTE  *lpszData;
    HANDLE hFile;
    LONG  lDataToSend, lDataSended = 0L;
 
    send(sock, "150\n", 4, 0);
 
    if(dataSock = socket(AF_INET, SOCK_STREAM, 0) == -1) return;
    dataSock = socket(AF_INET, SOCK_STREAM, 0);
 
    if(connect(dataSock, (struct sockaddr *)clientData, sizeof(*clientData)) != SOCKET_ERROR)
    {
        hFile = CreateFile(szMainFile, GENERIC_READ, FILE_SHARE_READ, NULL,
                OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
        if(hFile != INVALID_HANDLE_VALUE)
        {
            lDataToSend = GetFileSize(hFile, NULL);
            CloseHandle(hFile);
            lpszData = (BYTE*)lDataToSend;
 
            fp = fopen(szMainFile, "rb");
            if(fp)
            {
                fread(lpszData, sizeof(BYTE), lDataToSend, fp);
                fclose(fp);
            }
            send(dataSock, (char *)lpszData, lDataToSend, 0);
        }
        closesocket(dataSock);
    }
 
    send(sock, "226\n", 4, 0);
 
    printf( "File uploaded to %s", inet_ntoa( clientData->sin_addr ));
 
}
 
void FTPMakeClientData(char *src, struct sockaddr_in *clientData)
{
    char cClientIp[17], tmp[5];
    int i1, i2, i3, i4, p1, p2, iPort = 0;
 
    ZeroMemory(clientData, sizeof(clientData));
 
    sscanf(src, "%s %d,%d,%d,%d,%d,%d", tmp, &i1, &i2, &i3, &i4, &p1, &p2);
    sprintf(cClientIp, "%d.%d.%d.%d\0", i1, i2, i3, i4);
 
    iPort = 256*p1;
    iPort+= p2;
 
    clientData->sin_addr.S_un.S_addr = inet_addr( cClientIp );
    clientData->sin_family           = AF_INET;
    clientData->sin_port             = htons( iPort );
}
 
void FTPClient(LPVOID lpSocket)
{
    char buf[1024], cCmd[5];
    ZeroMemory(buf, sizeof(buf));
    ZeroMemory(cCmd, sizeof(cCmd));

 
    send((SOCKET) lpSocket, "220\n", 4, 0);
 
    while(1)
    {
        iLen = recv((SOCKET)lpSocket, buf, sizeof(buf) , 0);
 
        if(iLen == -1)
            break;
 
        strncpy(cCmd, buf, 4);
        cCmd[4] = 0;
       
        if(!strcmp(cCmd, "USER")) send((SOCKET) lpSocket, "331\n", 4, 0);
        else if(!strcmp(cCmd, "PASS")) send((SOCKET) lpSocket, "230\n", 4, 0);
        else if(!strcmp(cCmd, "PORT")) {
            FTPMakeClientData(buf, &clientData);
            send((SOCKET) lpSocket, "200\n", 4, 0); }
        else if(!strcmp(cCmd, "QUIT")) {
            send((SOCKET) lpSocket, "220\n", 4, 0);
            break;
        }
        else if(!strcmp(cCmd, "RETR")) FTPSendFile((SOCKET)lpSocket, &clientData);
    }
 
    closesocket((SOCKET) lpSocket);
}
 
void FTPServer()
{
    SOCKET iServer, iClient;
    struct sockaddr_in sServer;
    struct sockaddr_in sClient;
    DWORD dwThreadId = NULL;
    int clientSize = sizeof(sClient);

    WSADATA WsaData;
    int err = WSAStartup(0x0101, &WsaData);
    if (err == SOCKET_ERROR)
    {
        printf("WSAStartup() failed: %1d\n", GetLastError());
       
    }
 
    while(1) {
        dwFtpPort = 21;
        ZeroMemory(&sServer, sizeof(sServer));
 
        sServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
        sServer.sin_family           = AF_INET;
        sServer.sin_port             = htons( (int)dwFtpPort);
 
        iServer = socket(AF_INET, SOCK_STREAM, 0);
        if( iServer == INVALID_SOCKET )
            ExitThread(0);
 
        if( bind(iServer, (struct sockaddr *)&sServer, sizeof(sServer)) != 0) {
            Sleep(1000);
            continue;
        }
        if( listen(iServer, 4) != 0) {
            Sleep(1000);    
            continue;
        }
        break;
    }
 
 
    printf("FTP server created on port %d LastError: %d", dwFtpPort, WSAGetLastError());
 
    while(1)
    {  
        iClient = accept(iServer, (struct sockaddr*)&sClient, &clientSize);
        printf("\naccepted connection from %s, port %d", inet_ntoa(sClient.sin_addr), htons(sClient.sin_port));
        if(iClient == INVALID_SOCKET)
        {
            Sleep(500); continue;
        }
        else
            _beginthread(FTPClient, 0, (void *)iClient);
    }
 
    closesocket(iServer);
    ExitThread(1);
}