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Run FTB Modpacks from the Legacy FTB Launcher.

For un-modded Minecraft, run Minecraft from the AT Launcher.

If you are connecting to a Server running Minecraft 1.6.4 or earlier, then the current official Minecraft Launcher fails to pass the authentication session ID to the client. You may need to log out and back in again to make sure you get a new session.

If your authentication session has expired, or has been invalidated by another launcher you can create a new authentication session by restarting your Minecraft launcher. There may be a problem with Mojang’s authentication servers.

You are connecting to a Minecraft server of version 1.6.4 or earlier using the current official Minecraft launcher.The first launcher’s session is therefore invalid You logged into a second Minecraft launcher which started a new authentication session.Your current authentication session has expired.If the authentication data is not valid then you will get the error: Failed to Login: Bad Login The Minecraft Server then contacts Mojang’s authentication servers and asks if the authentication data is valid.

When you connect to a Minecraft Server, your Minecraft client sends data about your current authentication session to the Minecraft Server.