实验环境:CentOS6.8

主机:172.16.xxx.xxx:80

客户端:172.16.xxx.xxx

[root@www ~18:32:27]#telnet 172.16.xxx.xxx 80
Trying 172.16.252.242...
telnet: connect to address 172.16.252.242: Connection refused

解决方法:关闭SELinux:setenforce 0

     关闭防火墙策略:iptables -F

     启动telnet服务: chkconfig telnet on

     最好也启动xinetd监控服务:service xinetd start

[root@www ~18:33:36]#chkconfig --list|grep "telnet"  #检查telnet服务
    telnet:            off
[root@www ~18:34:03]#chkconfig telnet on
[root@www ~18:34:28]#chkconfig --list |grep "telnet"
    telnet:            on

[root@www ~18:29:40]#yum -y install xinetd    #安转xinetd服务

[root@www ~18:42:57]#service xinetd status
xinetd (pid 1452) is running...