WebSocket and ws works, wss won't

I tried to make a connection between my app and any web socket server with secure connection. Testing application is the one of those placed in Qt examples "sslechoclient"

On Linux/osx everything is ok but on windows websocket state won't be changed to "Open". After QAbstractSocket::ConnectingState nothing happens.

QSslSocket::supportSsl() returns true. QNetworkAccessManager works good with https, QSslSocket can make encrypted connection on 443 port successfully

Just as in example, I'm trying to ignore ssl erros but:

void SslEchoClient::onSslErrors(const QList<QSslError> &errors)

isn't executed (connection between signal/slot has been set properly)

Application won't show me any warning/any error, just nothing. I can't figure out what can be wrong here.

I'm using the latest version of openssl libraries provided as .dll files to the app root directory