一.问题描述:xshell连接不了虚拟机,出现错误提示:Could not connect to '192.168.1.100' (port 22): Connection failed. 二.查找错误原因: 1.登录虚拟机,打开终端,切换到root用户,输入systemctl start sshd.service看能否开启sshd服务,提示开启失败,输入systemctl status sshd.service查看错误详情,提示 failed to start openssh server d