For security purposes, administrators may wish to disable telnet (incoming connections) on a Solaris 10 system.
To disable telnet on a Solaris 10 system:
# svcadm disable telnet
To re-enable telnet on a Solaris 10 system:
# svcadm -v enable -r telnet
Steps to Follow
An example of functioning telnet, disabling of telnet, and then re-enabling telnet on a Solaris 10 system. If the system in question does not have console or terminal server access, another remote connection (ie. rsh/rlogin/ssh) may be required to make the change. Using telnet to connect while attempting to disable telnet will disconnect the window.