QTcpServer connected signal does not invoke corresponding slot in GUI application!!!!

[adie]

I have tried so many things but still problem persists.

I can see that server is started and can connect using telnet. But it does not invoke new connection slot. What seems to be wrong?

main.cpp

int main(int argc, char *argv[])
{
        core = new QGCCore(firstStart, argc, argv);
        val = core->exec();
}

int main(int argc, char *argv[])
{
        core = new QGCCore(firstStart, argc, argv);
        val = core->exec();
}

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QGCCore.cpp:

QGCCore::QGCCore(bool firstStart, int &argc, char* argv[]) : QApplication(argc, argv),
    restartRequested(false),
    welcome(NULL)
{
Server s;
s.listen();
}

QGCCore::QGCCore(bool firstStart, int &argc, char* argv[]) : QApplication(argc, argv),
    restartRequested(false),
    welcome(NULL)
{
Server s;
s.listen();
}

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server.cpp

#include "server.h"
#include <QTcpServer>
#include <QTcpSocket>
#include <cstdio>
#include <QDebug>
 
Server::Server(QObject *parent) :
    QObject(parent)
{
    server = new QTcpServer(this);
    connect(server, SIGNAL(newConnection()),
            this, SLOT(on_newConnection()));
    qDebug() << "Server instance created";
}
 
void Server::listen()
{
    server->listen(QHostAddress::Any, 1234);
    qDebug() << "Server listening to 1234";
}
 
void Server::on_newConnection()
{
    qDebug() << "New connection made!";
}

#include "server.h"
#include <QTcpServer>
#include <QTcpSocket>
#include <cstdio>
#include <QDebug>

Server::Server(QObject *parent) :
    QObject(parent)
{
    server = new QTcpServer(this);
    connect(server, SIGNAL(newConnection()),
            this, SLOT(on_newConnection()));
    qDebug() << "Server instance created";
}

void Server::listen()
{
    server->listen(QHostAddress::Any, 1234);
    qDebug() << "Server listening to 1234";
}

void Server::on_newConnection()
{
    qDebug() << "New connection made!";
}

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