ununtu sftp 로 접속시 알고리즘 지원 안한다고 나올때 chacha20-poly1305 ...... #sudo vi /etc/ssh/sshd_config Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,blowfish-cbc,aes128-cbc,3des-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc 추가 하고 #sudo service sshd restart 상태 확인 #sudo service sshd status