LinuxQuestions.org - connection refused in my client server program

I wrote a simple client server socket program in C.
The program did worked I compiled

Code:

cc server.c -o server.o

cc client.c -o client.o

and executed

Code:

./server.o

./client.o

Things were running successfully.
After this I disconnected and again tried to run the client program this time I got error

Code:

ooprs: client1: Connection refused

here is the code server.c

Code:

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

int

main ()

{

  int server_sockfd, client_sockfd;

  int server_len, client_len;

  struct sockaddr_in server_address;

  struct sockaddr_in client_address;

  server_sockfd = socket (AF_INET, SOCK_STREAM, 0);

  server_address.sin_family = AF_INET;

  server_address.sin_addr.s_addr = inet_addr ("127.0.0.1");

  server_address.sin_port = 9734;

  server_len = sizeof (server_address);

  bind (server_sockfd, (struct sockaddr *) &server_address, server_len);

  listen (server_sockfd, 5);

  while (1)

    {

      char ch;

      printf ("server waiting\n");

      client_len = sizeof (client_address);

      client_sockfd =

        accept (server_sockfd, (struct sockaddr *) &client_address,

                &client_len);

      read (client_sockfd, &ch, 1);

      ch++;

      write (client_sockfd, &ch, 1);

      close (client_sockfd);

    }



}

and client.c

Code:

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <stdlib.h>

int

main ()

{

  int sockfd;

  int len;

  int result;

  struct sockaddr_in address;

  char ch = 'A';

  sockfd = socket (AF_INET, SOCK_STREAM, 0);

  address.sin_family = AF_INET;

  address.sin_addr.s_addr = inet_addr ("127.0.0.1");

  address.sin_port = 9734;

  len = sizeof (address);

  result = connect (sockfd, (struct sockaddr *) &address, len);

  if (result == -1)

    {

      perror ("ooprs: client1");

      exit (1);

    }

  write (sockfd, &ch, 1);

  read (sockfd, &ch, 1);

  printf ("char from server = %c\n", ch);

  close (sockfd);

  exit (0);

}