ubuntu 拒绝ssh连接，连不上ssh，无法远程登录： Connection failed.

问题描述

[C:\~]$ Connecting to 192.166.8.85:22...
Could not connect to '192.166.8.85' (port 22): Connection failed.Type `help' to learn how to use Xshell prompt.
[C:\~]$ Connecting to 192.166.8.85:22...
Could not connect to '192.166.8.85' (port 22): Connection failed.Type `help' to learn how to use Xshell prompt.
[C:\~]$ Connecting to 192.166.8.85:22...
Could not connect to '192.166.8.85' (port 22): Connection failed.Type `help' to learn how to use Xshell prompt.
[C:\~]$ Connecting to 192.166.8.85:22...
Could not connect to '192.166.8.85' (port 22): Connection failed.Type `help' to learn how to use Xshell prompt.
[C:\~]$ Connecting to 192.166.8.85:22...
Could not connect to '192.166.8.85' (port 22): Connection failed.Type `help' to learn how to use Xshell prompt.
[C:\~]$ 

这种情况就是 openssh-server安装好了，也能ping通
尝试来连接立马就显示 连接失败！ssh一个空ip 地址 都会有一段的搜索时间
明显不是安装问题，而是配置问题

视窗 可视化桌面

把ssh key 代理打开了，不知道怎么打开的，关掉
OK打完收工！

命令行

建议关闭图形界面：
关闭
sudo systemctl set-default multi-user.target
恢复
sudo systemctl set-default graphical.target

关闭
ssh-agent -k

禁止自启动
eval $(ssh-agent)

查看进程是否在运行
ps aux | grep ssh-agent