Whenever I try to connect to a multiplayer server, the message "log in failed: authentication is unreachable" pops up. I've redownloaded minecraft, turned off my firewall, logged in and out, restarted my computer, checked my computers terminal, restarted my router, and to no avail. It has been doing this for a week, and I haven't been able to play on servers at all. I don't know how to fix it. My user is CookieCrumer2000, and I have a mojang account.