So I was joining a friend earlier today and we both got the error, we had just started the launcher and both are premium and had premium ticked.
first time I had played on the new launcher and he had used it before but not with aternos, the server had been used a few times before and had worked.
we were playing 1.6.4 super hostile infernal skies
we checked our error logs and they were near identical
|15:21:43||launcher||Preparing to launch minecraft client for 1.6.4|
|15:21:43||launcher||Minecraft client 1.6.4 is ready to start.|
|15:21:43||launcher||Version does not support log configuration, will assume one plaintext entry per line|
|08:21:45||game||2017-02-19 15:21:45 [CLIENT] [INFO] Setting user: darkfrost1802|
|08:21:45||game||2017-02-19 15:21:45 [CLIENT] [INFO] (Session ID is -)|
|08:21:45||game||2017-02-19 15:21:45 [CLIENT] [INFO] LWJGL Version: 2.9.0|
|08:21:45||game||2017-02-19 15:21:45 [CLIENT] [INFO] Reloading ResourceManager: Default|
|08:21:46||game||Starting up SoundSystem...|
|08:21:46||game||Initializing LWJGL OpenAL|
|08:21:46||game||(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)|
|08:21:47||game||2017-02-19 15:21:47 [CLIENT] [SEVERE] Realms: Server not available!|
|08:21:54||game||2017-02-19 15:21:54 [CLIENT] [INFO] Connecting to offline.aternos.org., 25565|
|08:21:59||game||2017-02-19 15:21:59 [CLIENT] [INFO] Stopping!|
|08:21:59||game||SoundSystem shutting down...|
|08:21:59||game||Author: Paul Lamb, www.paulscode.com|
|08:21:59||game||Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release|
|15:21:59||launcher||Process closed with exit code 0|
That's all we could figure out, help would be greatly appreciated.