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These instructions will work on any FreeBSD install, but you don't necessarily need nano to accomplish it. On a jail on FreeNAS you need nano because the keyboard combinations required to edit the config files cannot be executed on the web gui console.
Make sure root password is set:
Update pkg database:
Install nano text editor:
pkg install nano
Open ssh daemon config file with nano:
ctrl + shift + w to find text
Un-hash and edit the following values:
ctrl + shift + x to exit nano
Y to save changed
Enter to confirm write
Enable the SSH daemon:
Start SSH daemon:
service sshd start