Same location as your .minecraft (that whole %appdata% thing, Google it if you need further help). Inside the .aether folder there's a folder titled config. Deleting it should reset your IDs and configuration values and allow you to join.
In the config folder in the .minecraft file. Or you can just delete the file in order to reset the ids. Or just get a new copy of the Aether II. If you are using the Aether Launcher, it's in the .aether file.
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Thanks! I got It working.
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Where do I find the .aether file?
Also, im on a mac if that helps.
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