QTcpServer and port problem

[Talei]

Hello.
I have a problem with setting up a port for QTcpServer.

void MainWindow::initServ()
{
    QHostAddress adr;
    adr.setAddress( QString("127.0.0.1") );
    adr.toIPv4Address();
    quint16 port = 5050;
 
    QTcpServer *CRserv = new QTcpServer();
    CRserv->setMaxPendingConnections( 10 );
    CRserv->setProxy(QNetworkProxy::NoProxy);
 
    if (!CRserv->listen()) {
        QMessageBox::critical(this, tr("CR_bypasser"),
                              tr("Unable to start the server: %1.")
                              .arg(CRserv->errorString()));
        close();
        return;
    }else{
        CRserv->listen( adr, port );
    }
}

void MainWindow::initServ()
{
    QHostAddress adr;
    adr.setAddress( QString("127.0.0.1") );
    adr.toIPv4Address();
    quint16 port = 5050;

    QTcpServer *CRserv = new QTcpServer();
    CRserv->setMaxPendingConnections( 10 );
    CRserv->setProxy(QNetworkProxy::NoProxy);

    if (!CRserv->listen()) {
        QMessageBox::critical(this, tr("CR_bypasser"),
                              tr("Unable to start the server: %1.")
                              .arg(CRserv->errorString()));
        close();
        return;
    }else{
        CRserv->listen( adr, port );
    }
}

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When i setup server this way i got in appliaction output window:
"QTcpServer::listen() called when already listening"

Thanx in advance for any reply.
Best regards