telnet 127.0.0.1 80
After the call, if prompted bash: telnet: command not found, then the following steps:
1, telnet check whether installed or not installed part;
telnet -qa * RPM
2, all lists all telnet installation package;
* List telnet yum
3, telnet server installation
telnet-Server the install yum
. 4, telnet client installation
yum install telnet
At this point, the installation is successful, you can use telnet 127.0.0.1 80 Test port number is open