WinSock - один send и работает, и нет

#include <stdio.h>
#include <winsock.h>
 
#define DEFAULT_BUFLEN 512
 
    char * pch1;
    char * pres;
    char * pres1;
 
    int iResult;
    SOCKET ConnectSocket;
    char recvbuf[DEFAULT_BUFLEN] = "";
    char recvbuf1[DEFAULT_BUFLEN] = "";
    int recvbuflen = DEFAULT_BUFLEN;
 
int sendandrecv (char* myarg)
{
    char sendall[300];
    char *sendbuf1;
    char *spart3;
 
    sendbuf1 = "POST /profile/do/ HTTP/1.1\nHost: site.ru\nAccept-Charset: windows-1251,utf-8\nContent-Type: application/x-www-form-urlencoded\nContent-Length: 14\nCookie: ";
    spart3 = myarg;
 
    strcpy (sendall, sendbuf1);
    strcat (sendall, pres);
    strcat (sendall, spart3);
 
    iResult = send( ConnectSocket, sendall, (int)strlen(sendall), 0 );
    if (iResult == SOCKET_ERROR) {
        printf("send() failed with error: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }
 
    iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
    if ( iResult > 0 )
        printf("Bytes received: %d\n", iResult);
}
 
int main() {
 
    WSADATA wsaData;
    struct sockaddr_in clientService;
    char *sendbuf = "POST /auth/ HTTP/1.1\nHost: site.ru\nAccept-Charset: windows-1251,utf-8\nContent-Type: application/x-www-form-urlencoded\nContent-Length: 25\n\nlogin=login&password=pass";
 
    //----------------------
    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != NO_ERROR) {
        printf("WSAStartup failed with error: %d\n", iResult);
        return 1;
    }
 
    //----------------------
    // Create a SOCKET for connecting to server
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        printf("socket failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }
 
    //----------------------
    // The sockaddr_in structure specifies the address family,
    // IP address, and port of the server to be connected to.
    clientService.sin_family = AF_INET;
    struct hostent * host_addr = gethostbyname("site.ru");
    clientService.sin_addr.s_addr = *((int*)*host_addr->h_addr_list);
    clientService.sin_port = htons( (unsigned short)80);
 
    //----------------------
    // Connect to server.
    iResult = connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) );
    if (iResult == SOCKET_ERROR) {
        printf( "connect failed with error: %d\n", WSAGetLastError() );
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
  }
 
    //----------------------
    // Send an initial buffer
    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );
    if (iResult == SOCKET_ERROR) {
        printf("send() failed with error: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }
 
    printf("Bytes Sent: %d\n", iResult);
 
        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 ) {
            printf("Bytes received: %d\n", iResult);
            printf("\n%s\n", recvbuf);
 
            pch1 = strstr (recvbuf, "Set-Cookie:");
            pres = strtok (pch1+12, "\n");
            pres1 = pres;
            printf("\n__%s\n", pres);
 
        }
        else if ( iResult == 0 )
            printf("Connection closed\n");
        else
            printf("recv failed with error: %d\n", WSAGetLastError());
 
 
    // !!! ВОТ ЭТИ СЕНДЫ. Точнее вызовы функции, в которой сенды
            
    sendandrecv("text_zaprosa_1");
    
    sendandrecv("text_zaprosa_2");
 
 
    closesocket(ConnectSocket);
    WSACleanup();
 
    return 0;
}