There are several users (including me) who observed that some Websocket requests from Reforis are blocked on Windows. The current hypothesis was that it is only caused by AVG and Avast antiviruses (turning off HTTPS scanning in them solved the issue). I think you’re the first on having this issue without any of these two AVs.
There is already a lengthy discussion about this topic (unfortunately, in Czech): Nelze potvrdit žádné nastavení v reForis .