Found this article which said:
sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist sudo launchctl load /System/Library/LaunchDaemons/ssh.plist
Restarting sshd on Mac OS X
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Daily Archives: 2014-07-15 [Tuesday]
Run sshd on Mac OS X
Found this article which said: open System Preferences, click Sharing and check Remote Login.