Unable to log in client

When I start up the game, I'm greeted with a grayed out username, password and sign in tab. Above the username tab it says that it is unable to log in because I may be offline. This would all be great if it weren't for one thing. My internet is fine. I restarted the router multiple times, did ipconfig /renew and etc.

It all started when, during the loading screen before a game, it randomly crashed. I had to restart the whole game. Then it happened again and I had to restart again. A day after that the above part started happening. I tried to google the error, tried a couple of solutions, the system32/host one, the delete a line of code in the config file. And none of it worked.