When ever I seem to join the server I get a message saying: {failed to connect to the server}[Failed to login: The authentication are currently down for maintenance.] Yet I can see theirs still people online in the server. I'm not the only one that's getting this message, some of my buddies are also having the same experience.
Looks to be up and running for me. Also used this website Minecraft Status · Is Minecraft Down? and it's saying everything is fine are you still having issues?[DOUBLEPOST=1450053076,1450051942][/DOUBLEPOST]Going to mark this as solved as no reply if you have anymore connection issues feel free to reply.
Many times Mojang itself will have issues. If it persists and Minecraft is up and running properly but you cannot get into the game then please let us know. It could be a password issue or something more.