Not quite sure, never had any issues with connecting to my Synology NAS shared folders. You could try using SMB protocol instead of AFP. I guess that'd be a general permissions issue. Maybe you can find more info in more general forums how to deal with permission issues on Mac with Airport Extreme ...

Hey redNoah and all, Fantastic product, sad I just found out about this :( but great going forward :D Anyways, I'm having an issue with the drag and drop to give FileBot folder permissions of my external hard drives that are plugged into my Airport Extreme. I drop the external drives or folders on ...