Check network connection

[yogeshgokul]

I'd suggest you to use

socket->connectToHost("hostName", portNumber);
 if (socket->waitForConnected(1000))
     qDebug("Connected!");

socket->connectToHost("hostName", portNumber);
 if (socket->waitForConnected(1000))
     qDebug("Connected!");

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.
In this method, you can try connecting to a valid host to a period of time and if it succeeds then fine otherwise time out will occur. The value of trying time is in your hands.