[SFML Network] Błąd z połączeniem dwóch komputerów

#pragma comment(lib, "sfml-network.lib")
#include "stdafx.h"
#include <iostream>
#include <SFML/Network.hpp>

const unsigned short PORT = 5000;
const std::string IPADDRESS( "//MOJ  ADRES IP POBRANY Z whatismyipaddress.com" );

std::string msgSend;

sf::TcpSocket socket;
sf::Mutex globalMutex;
bool quit = false;

void DoStuff( void )
{
    static std::string oldMsg;
    while( !quit )
    {
        sf::Packet packetSend;
        globalMutex.lock();
        packetSend << msgSend;
        globalMutex.unlock();
       
        socket.send( packetSend );
       
        std::string msg;
        sf::Packet packetReceive;
       
        socket.receive( packetReceive );
        if( packetReceive >> msg )
        {
            if( oldMsg != msg )
            if( !msg.empty() )
            {
                std::cout << msg << std::endl;
                oldMsg = msg;
            }
        }
    }
}
void Server( void )
{
    sf::TcpListener listener;
    listener.listen( PORT );
    listener.accept( socket );
    std::cout << "New client connected: " << socket.getRemoteAddress() << std::endl;
}
bool Client( void )
{
    if( socket.connect( IPADDRESS, PORT ) == sf::Socket::Done )
    {
        std::cout << "Connected\n";
        return true;
    }
    return false;
}
void GetInput( void )
{
    std::string s;
    std::cout << "\nEnter to quit or message to send: ";
    std::cin >> s;
    if( s == "exit" )
         quit = true;
   
    globalMutex.lock();
    msgSend = s;
    globalMutex.unlock();
}
int main( int argc, char * argv[] )
{
    sf::Thread * thread = 0;
   
    char who;
    std::cout << "Do you want to be a server (s) or a client (c) ? ";
    std::cin >> who;
   
    if( who == 's' )
         Server();
    else
         Client();
   
    thread = new sf::Thread( & DoStuff );
    thread->launch();
   
    while( !quit )
    {
        GetInput();
    }
    if( thread )
    {
        thread->wait();
        delete thread;
    }
    return 0;
}