Telnet cannot be used under Linux

yum installation method processing

1. Check the linux version

cat /etc/issue

2. Check whether telnet has been installed

rpm -qa | grep telnet

The above shows that it is already installed, so there is no need to install it again. If not, go to the next step.

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3. Install telnet and telnet-server

Note: required Install with root privileges

yum install telnet

yum install telnet-server

4. Because after installing the telnet service, the service is not enabled by default. Next we need to modify the file to enable the service.

vi /etc/xinetd.d/telnet

Modify disable = yes to disable = no

:wq!

5. Need to activate xinetd service

service xinetd restart

6. Need to test whether telnet is successfully opened

telnet localhost

If there is no problem with the previous operations, you can log in successfully by entering the username and password.

7. When you use other machines to remotely telnet, if it fails, it is likely to be a firewall problem. Let’s modify the firewall settings.

First, use netstat –tunlp Check whether port 23 is blocked by the firewall;

Then use iptables to modify the settings;

Use service iptables save Save the settings;

Thenservice iptables restartRestart the firewall.

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