Server login and authentication are currently unstable and will be for about 1 hour 20-30 mins. Keep up with them here: http://xpaw.ru/mcstatus/
Just a simple server error... Mojang is a massive company. Nothing completely serious as far as I know.
It is possible that there is something serious as the down time is steadily going up but i wouldn't worry about it.
The current down time is about 2 hours. I don't know for sure when it will be back up. Play some single player and some music (that's what i do), before you know it they should be up. I will message you as soon as I see that they are working.
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