Fortnite doesn't work why?

I can't play fortnite do you have any idea what else I can do. Because whenever I start a mode it comes:

I have already been to the website but it says nothing, do you have any ideas what I can do? Or do you know a phone number because there isn't one?

Write to customer service

Possibly allow the game in the Windows firewall: https://www.heise.de/...86486.html