'What is needed for a Secure WebSocket connection on Windows 10

I wrote a QT tool using WebSockets with SSL. When I roll it out to an other Windows 10 machine it doesn't connect but produces a QAbstractSocket::UnsupportedSocketOperationError on Client side. On server side I don't get any notification that a new client has connected.

The tool "Dependencies" shows no difference in dll's, a test without SSL worked fine as well as connecting from same network with my developer machine.

As is works fine with my developer machine I assume something is wrong/missing on the other Windows 10 machine. I have installed OpenSSL 1.1.0f on it but I have no idea what else to look for.

windows qt ssl websocket

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'What is needed for a Secure WebSocket connection on Windows 10

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