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I can confirm now that there are issues with non-standard ports (:20080) and redirections.
So like Kaustubh Ghadge suggested (thank you btw), please add the port back to the URL when you get redirected to localhost/auth.
We'll add a workaround soon
Hard to say what is going on. Might be some (local/os) firewall that is in the way.
If you have time, come and join us on our community server https://latest.cortezaproject.org and find me there. Maybe we can figure this one out there.