Bad dog! Bad dog! I mean Bad Login!
Ugh! Failed to login: Bad login! Towncraft is broken!
Actually it’s not Towncraft. It’s an issue at Mojang, and they’re working on it. Keep trying and eventually you’ll connect. It’s happening with every server on 1.6.4.
But the good news is it sounds like 1.7.2 for Bukkit is coming soon so we can finally put this behind us and get to enjoy all the new goodies in 1.7.2!