I can play AotBT just fine on single player, but when it comes to playing on servers, I encounter this error (evinced by the image if ya scroll down a tad).
Java exception, error 403.
www.minecraftforum.net/topic/2735633-aotbt-error-403-javaioioexception-session-id-failing-to-login
Any insights you have to fix this? Vanilla servers work fine.