Here is a program on windows sockets, which is supposed to display HTML code from port 80 of the requested ip .

 #define WIN32_LEAN_AND_MEAN #include <winsock2.h> #include <Ws2tcpip.h> #include <stdio.h> #include <stdlib.h> // Link with ws2_32.lib #pragma comment(lib, "Ws2_32.lib") #define DEFAULT_BUFLEN 32768 #define DEFAULT_PORT "80" int __cdecl main() { re: //---------------------- // Declare and initialize variables. WSADATA wsaData; int iResult; SOCKET ConnectSocket = INVALID_SOCKET; struct sockaddr_in clientService; char *sendbuf = "GET / HTTP/1.1\n\n"; char recvbuf[DEFAULT_BUFLEN]; int recvbuflen = DEFAULT_BUFLEN; //---------------------- // Initialize Winsock iResult = WSAStartup(MAKEWORD(2,2), &wsaData); if (iResult != NO_ERROR) { printf("WSAStartup failed: %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("Error at socket(): %ld\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; clientService.sin_addr.s_addr = inet_addr( "91.000.000.00" ); clientService.sin_port = htons( 80 ); //---------------------- // Connect to server. iResult = connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) ); if ( iResult == SOCKET_ERROR) { closesocket (ConnectSocket); printf("Unable to connect to server: %ld\n", WSAGetLastError()); WSACleanup(); return 1; } // Send an initial buffer iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 ); if (iResult == SOCKET_ERROR) { printf("send failed: %d\n", WSAGetLastError()); closesocket(ConnectSocket); WSACleanup(); return 1; } printf("Bytes Sent: %ld\n", iResult); // shutdown the connection since no more data will be sent iResult = shutdown(ConnectSocket, SD_SEND); if (iResult == SOCKET_ERROR) { printf("shutdown failed: %d\n", WSAGetLastError()); closesocket(ConnectSocket); WSACleanup(); return 1; } // Receive until the peer closes the connection do { iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0); if ( iResult > 0 ) printf("Bytes received: %d\n", iResult); else if ( iResult == 0 ) { printf("Connection closed\n"); printf(recvbuf);} else printf("recv failed: %d\n", WSAGetLastError()); } while( iResult > 0 ); // cleanup closesocket(ConnectSocket); WSACleanup(); system("pause"); goto re; return 0; } 

Not only with every 5-10 attempt comes the code. What is the problem?

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