When posting a file of size >3kb using QHttpMultiPart request on Windows 10, QNetworkReply doesn't emit error,sslError or finished signals for 2-3 minutes and finally it returns QNetworkReply::RemoteHostClosedError. During the upload it emits uploadProgress signal only once indicating 0% of the data is sent. Even If the internet connection of the computer is disabled, reply still doesn't emit error signal unless abort function is called. This problem is not observed on MacOsX with the same code and server.