secureCRT连接Ubuntu失败

1.检查sshd

1.1 查询是否安装ssh

whereis ssh

这里如果安装了ssh，会显示具体位置

1.2 如若没有，则进行安装

sudo apt-get install openssh-server openssh-client

1.3 查询ssh的状态

service sshd status

这里需要ssh处于running状态

2.安装之后还是连接不上

2.1 检查防火墙

sudo ufw status

保持防火墙在inactive状态，如果是active状态，执行下列命令

sudo ufw disable

2.2 Key exchange failed错误

Key exchange failed.
No compatible key-exchange method. The server supports these methods: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256

如果遇到这个错误则修改/etc/ssh/sshd_config文件，添加下面配置

KexAlgorithms [email protected],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

注：这一段添加在配置文件的最后即可

2.3 重启sshd

service sshd restart