The problem: you have a computer sitting behind a firewall. You want to access it from a different location, but you don’t have the ability to forward any ports to it. The answer: SSH tunneling.
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Need passwordless auth with ssh? Need it really really fast? 3 steps and you’re done.

1. ssh-keygen -t rsa      (don’t enter a passphrase)
2. ssh-copy-id -i ~/.ssh/id_rsa user@remotehost
3. ssh user@remotehost

Wasn’t that easy?