How to set up telnet in AWS instance?

 sudo yum -y install telnet

This works for me after logging in to the EC2 instance

ssh is recommended over telnet, as telnet is not encrypted and is by default not installed in amazon instance.

However if needed, steps involved for Linux : Amazon Instance or Centos

Install telnet daemon in the instance: Install telnet-server using sudo yum install telnet-server . Package telnet is for the client program in case one want to connect using telnet client from the instance, not needed for the exercise.
Enable the telnet daemon service: - By default the service is disabled in /etc/xinetd.d/telnet, The disable flag needs to be set to no.

service telnet { flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID disable = yes }

Post change it should look like below service telnet { flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID disable = no }

Verify the configuration in case of any edit related errors. sudo chkconfig xinetd on
Bring up the telnet service:

Bring up the telnet daemon as root using sudo service xinetd restart command
Enable inbound telnet default port (23) on AWS Console: In AWS Console EC2/Security Groups/<Your Security Group>/Inbound, set a rule

Type:Custom-TCP Rule

Protocol: TCP Range

Port Range: 23

Source: <As per your business requirement>
Test the telnet connection: Test the telnet connection from any client enabled in the firewall.

>telnet ec2-XX-XX-XXX-XXX.region.compute.amazonaws.com. Connected to ec2-XX-XX-XXX-XXX.region.compute.amazonaws.com. Escape character is '^]'. Password:

The steps(tools) will vary slightly for other linux variants.

PS: Referred http://aws-certification.blogspot.in/2016/01/install-and-setup-telnet-on-ec2-amazon.html, fixed few issues in the commands.

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