It seems that I have the same problem now after switching ISP recently.
I also tried new pre-release client versions with no luck.
I can login using mobile LTE connection but of course its too unstable and laggy to play with other players.

The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Latest posts made by sernikb2
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RE: Lost connection to server during login