使用SSH Secure Shell工具连接报错如下：
Server responded "Algorithm" negotiation failed" Key exchange with the remote host failed. This can happen for example if the remote host computer does not support the selected algoritms
解决方法，登录主机：
更改 /etc/ssh/sshd_config文件。
执行命令：
vi /etc/ssh/sshd_config
在 PasswordAuthentication yes 的后面追加如下内容。
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
然后重启ssdh
systemctl restart sshd.service
也可以使用命令
service sshd restart
查看下sshd的状态
六：在重新使用SSH Secure Shell 工具连接即可。
