错误

利用java连接Linux服务器中碰到错误：Key exchange was not finished, connection is closed.，导致服务器的连接失败，报错如下

原因

是ssh中的key交换算法不兼容导致

解决办法

修改配置文件

vi /etc/ssh/sshd_config 

添加如下内容

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 

重启服务

systemctl restart sshd 

启动报错

如果重新启动ssh出现错误Start operation timed out. Terminating.Failed to start openbsd secure shell server，可以尝试如下解决办法

关闭由systemctl控制的ssh启动

systemctl stop ssh.service  

删除ssh的服务配置文件

rm /lib/systemd/system/ssh.service 

重载systemctl和ssh服务

systemctl daemon-reload systemctl start ssh.service 

祝大家好运