c TCP socket connection refused for localhost

I'm trying to make a client/server program in localhost but the client can not connect to the server and I do not know what I'm doing wrong.

I have tried to debug the program and all the parameters seem to be ok.The server does bind, connect, listen and accept.

With the client code a get connect: Invalid argument error. Client (I'm calling the client from the console with ./client localhost):

#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>

int main(int argc, char * argv[])
{
    int cd;
    struct hostent *hp;
    struct sockaddr_in s_ain;
    unsigned char byte;

    hp = gethostbyname(argv[1]);
    bzero((char *)&s_ain, sizeof(s_ain));
    s_ain.sin_family = AF_INET;
    memcpy(&(s_ain.sin_addr),  hp->h_addr, hp->h_length);
    s_ain.sin_port = htons(1025);

    cd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if( connect(cd, (struct sockaddr*) &s_ain, sizeof(s_ain) == -1) ) {
        fprintf(stderr, "connect: %s\n", strerror(errno));
        return -1;
    }       

    printf("%s\n", "IT WORKS!");
    close(cd);
    return 0;
}

Server:

#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>

int main(void)
{
    int sd, cd;
    socklen_t size;     
    unsigned char byte;
    struct sockaddr_in s_ain, c_ain;    

    sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    bzero((char *)&s_ain, sizeof(s_ain));
    s_ain.sin_family = AF_INET;s_ain.sin_family = AF_INET;
    s_ain.sin_addr.s_addr = INADDR_ANY;
    s_ain.sin_port = htons(1025);

    if(bind(sd, (struct sockaddr *)&s_ain, sizeof(s_ain)) == -1) {
        fprintf(stderr, "%s\n", "err bind");
        return -1;
    }

    if(listen(sd, 5) == -1) {
        fprintf(stderr, "%s\n", "err listen");
        return -1;
    }

    while(1) {
        size = sizeof(c_ain);
        cd = accept(sd, (struct sockaddr *)&c_ain, &size);
        printf("%s\n", "IT WORKS !");
    }
}

Either you have a typo in your example, or

if( connect(cd, (struct sockaddr*) &s_ain, sizeof(s_ain) == -1) ) {
    fprintf(stderr, "%s\n", "err connect");
    return -1;
}

has wrong parenthesis. Currently you will call connect with socklen_t addrlen as 0. It should read

if( connect(cd, (struct sockaddr*) &s_ain, sizeof(s_ain)) == -1) {
    fprintf(stderr, "%s\n", "err connect");
    return -1;
}