ssh secure Shell连接阿里云服务器，报错的问题，openssh无法登录：server responded "algorithm negotiation failed”

1、putty登录连接到阿里云服务器

2、修改ssh的配置文件 

vi /etc/ssh/sshd_config

切换编辑模式（i），设置参数

PasswordAuthentication yes

在配置文件末尾添加：

Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,arcfour128,arcfour256,arcfour,blowfish-cbc,cast128-cbc

MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-sha1-96,hmac-md5-96

KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,curve25519-sha256@libssh.org

重启sshd服务后，ssh客户端重新连接成功

sudo service ssh restart