If you're stuck with telnet, you can specify who can/cannot login with /etc/security/access.conf. You will need to add the line:
account required /lib/security/pam_access.so
to
/etc/pam.d/login
and a reboot.
LOL, you can always tell who came from a microsoft background!
It's possible a service could be restarted instead of rebooting, but I never tracked that down.
telnet normally runs under xinetd, so....
Joe
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