Siemka. 
Yea I verify this also. Even turned off IPv6 on my connection. Maybe InternetProvider UPC have IPv6 on his main router? But I was able to play a year ago...
I even tried to connect via VPN through my company network but still wont work.
EDIT: ok I think problem solved. I login on my switch and I saw internet provider change my network connection to IPv6 as a test XD without informing me about this hehe. I called to them and they will change this to default IPv4. 
I have new machine and download game from scratch.
Client launch with success and download all updates. But when i click Play and try to log in I have "an error has occurred please try again later". And I know Login and Pass. are correct cause I logged in with success on website. I even connect accounts steam/gameforge. And I have the same problem on steam and on Client without steam.
Yesterday I fight with this for 3hr 
Good to see this video. But I'v tried everything. Even shut down all defenses of my computer and nothing works.
I returned to game after a year break. Maybe that's the case?
