Server wont let me join! :(

Usually I can log on and off all of my servers no problem. But today (4/6/17) I logged on, went to multiplayer, selected my server and pressed "Join Server". It displayed "Logging in" for a few seconds, then displayed "Not authenticated with Minecraft.net". I can't get pass this bug and I tried everything, refreshing, restarting my game even deleting the server and re-adding it. This happened with every server I tried and it's just the same. PLEASE HELP ME AND SOLVE THIS PROBLEM!