xshell无法连接centos7

遇上的问题，做个简单记录

（先确认网络是否正常连接） Could not connect to '192.168.xx.xxx' (port 22): Connection failed 1、开放22端口 https://www.cnblogs.com/xxx91hx/p/4374289.html 2、提示firewall is not run https://www.cnblogs.com/kccdzz/p/8110143.html 3、执行 systemctl start firewalld 命令后出现Failed to start firewalld.service: Unit is masked https://blog.csdn.net/chen_yi_ping/article/details/76690704 连接成功