It started yesterday, I've tried to access game from both PS4 and PC. There were no changes to a network, PS4 is connected to a wi-fi, but PC has wired connection to a same router. If this was a problem on an ISP side, then it's strange that there is also errors on http checkers online.
stats for secure.square-enix.com: http://r.h-t.co/en/3/e51777c5-e334-e...2-0003ff73517a
stats for eu.finalfantasyxiv.com: http://r.h-t.co/en/3/16d6da3a-e434-e...2-0003ff73517a (notice how it has errors when trying to access from Russian Federation)