https://www.pcgamer.com/fortnite-servers-are-temporarily-down-while-epic-investigates-problems/

Epic has just announced it is taking Fortnite's servers down temporarily, due to ongoing server issues following the roll out of Season 5 earlier today. 

"We're currently investigating issues with our game services, which include matchmaking and login, " the studio tweeted earlier today. Then, a little later: "We're taking servers down to further investigate the root cause, we'll keep you updated on the status as we dig in."