Yesterday, I downloaded craftbukkit 1.6.4 recommended build, I config the server.properties, after that, I started the server, the server seem like worked fine (I though so). In Minecraft client, I selected ver 1.6.4 (I'm using minecraft teamextreme ver), the launcher update normally and then the game started. When I tried to connect to my own server, a message appear said: Failed to login: Bag login. I looked for google, the result is he told me that the minecraft version 1.6.4 is error and can't connect the the server. Then today, I download craftbukkit 1.7.9 ro3 (i don't remember exactly), start the server, change to minecraft client version to 1.7.9, started the game,but, dissapointing, a message appeared again and said: Failed to login: The authentication are currently down for maintenance. I'm really confused now, can somebody help me please ?