安装telnet
在telnet Server服务器上执行命令
yum -y install telnet telnet-server
rpm -ql telnet
rpm -ql telnet-server
rpm -qa | grep xinetd
yum -y install xinetd
执行下面的telnet 被拒绝无法登陆
telenet 127.0.0.1
telenet 192.168.0.111 23 
解决方案
启动telnet服务，设置开机自启
systemctl start telnet.socket
systemctl enable telnet.socket
systemctl status telnet.socket
退出telnet
quit
