QTcpServer fails to start listening, reporting "Unknown error" (QAbstractSocket::UnknownSocketError).
"::bind" call returns false.

Simple program to illustrate (works with Qt 4.8.2)

project file:

QT       += core network

TARGET = tcpserver
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp

source file:

#include <QCoreApplication>
#include <QTcpServer>
#include <QDebug>

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);
	QTcpServer srv;
	bool r = srv.listen();
	qDebug() << srv.errorString();
	return r;
}

After rebuilding network module with debug enabled, I get the following output for the given example program:

WSA error : WSAEFAULT
more details (Система обнаружила недопустимый указатель адреса при попытке использовать в вызове аргумент указателя.)
(unlocalize.com untranslates this message as
The system detected an invalid pointer address in attempting to use a pointer argument in a call.)
QNativeSocketEnginePrivate::nativeBind(0.0.0.0, 0) == false (Unknown error)

If I specify address to listen explitily, or use QHostAddress::AnyIPv4 or QHostAddress::AnyIPv6 server starts:

bool r = srv.listen(QHostAddress("127.0.0.1")); //ok
bool r = srv.listen(QHostAddress::AnyIPv4); //ok
bool r = srv.listen(QHostAddress::AnyIPv6);// ok
bool r = srv.listeb(QHostAddress::Any); //not ok