Hmm.
tomoe, do I understand correctly that you can sit down at the school computer (or SSH into a school machine) and subsequently from there SSH into the iMac which is at your home? But you can't SSH from school into the laptop even if you activate SSH serving on it, disable the firewall, and plug the laptop in the same exact place the iMac is normally plugged into? How do the laptop and the iMac connect to the Internet, for that matter?
I'm pretty sure you'll find a firewall or port forwarding at work somewhere (the laptop, a router of yours you didn't mention, a router at the dorm...) that explains this. They can mess connections in just one direction.
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