ssh-add -L # checek if key added
ssh-add # add it
# Permanently add to macOS - http://unix.stackexchange.com/a/140077
ssh-add -K ~/.ssh/id_rsa
vim /etc/ssh/sshd_config
Add this to file
ClientAliveInterval 30
TCPKeepAlive yes
ClientAliveCountMax 99999
sudo service ssh restart