Qt5.9 QTcpSocket connectToHost fail

int main(int argc, char *argv[])

{

QCoreApplication a(argc, argv);

QTcpSocket client;

client.connectToHost(QHostAddress("10.176.0.22"), 13);

if(client.waitForConnected()) qDebug()<<"Here0";

QAbstractSocket::SocketState state = client.state();

qDebug()<<state;

if(client.waitForReadyRead())

qDebug()<<"Here1";

qDebug()<<client.readAll();

return a.exec();

}