ssh 안될때

/usr/sbin/sshd -ddd

ssh-keygen -f /etc/ssh/ssh_host_rsa_key -t rsa -N ""
ssh-keygen -f /etc/ssh/ssh_host_ecdsa_key -t ecdsa -N ""
ssh-keygen -f /etc/ssh/ssh_host_ed25519_key -t ed25519 -N ""