Check whether installation services
rpm -qa | grep telnet
Installation telnet and xinetd
yum install telnet
yum install xinetd
yum install telnet-server
Modify telnet configuration
vim /etc/xinetd.d/telnet
disable=yea改为disable=no
Restart xinetd service
service xinetd restart
Open port 23
iptables -I INPUT -p tcp --dport 23 -jACCEPT
iptables -I INPUT -p udp --dport 23 -jACCEPT
service iptables save
service iptables stop
Use the windows cmd
telnet virtual machine ip address