On Windows 7, QTcpSocket::waitForConnected(x) doesn't take into account the timeout given (x), and always waits (blocks) for 30-40 seconds.

In the following code snippet, under Windows 7 (32-bit), waitForConnected(5000) waits about 30-40 seconds instead of 5. Under Xubuntu, the issue doesn't show up, and it waits only 5 seconds.

#include <QCoreApplication>
#include <QTcpSocket>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

QTcpSocket socket;
qDebug() << "connecting";
socket.connectToHost("192.168.78.234" , 2000);
qDebug() << "wait for connect return " << socket.waitForConnected(5000);

return a.exec();
}