I can not can enter your server

[lolo_2k2]

someone help me
I can not can enter your server
Why?

[MyHatismyFriend]

Do you have a registered Minecraft account?

[Cucoo5]

Typically what Hat said.
otherwise your computer just doesn't like you right now, try rebooting. (Happens to me sometimes.)

[Remilia Scarlet]

Buy an account.

[Suzzie2]

Either that or if your like me, you try to play a minecraft server on 1.6.2 and 1.6.4 at the same time, and you log out of one and try to log back in... And then you have to close minecraft and restart it