ssh

安装ssh

# The remote system refused the connection.
apt install openssh-server
ps -ef | grep ssh查看有没有sshd

　　

远程登录到1.2.3.4，用户yanfa

ssh yanfa@1.2.3.4
# 输入密码

　　

断开ssh连接

exit

　　

Key exchange failed.

vim /etc/ssh/sshd_config
>>KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
# root login
>>#PermitRootLogin prohibit-password (注释掉)
>>PermitRootLogin yes
service sshd restart