How to retrict telnet access to my machine?

[Dr. Muhammad Masroor Ali]

Hello All,
I am running freeradius on a Mandrake 7.1 machine. If I want
to restrict telnet/rsh access of the users to this machine, what
should I do? Changing the /bin/bash to /bin/false in /etc/passwd
returned invalid login for these users. Any help will be 
appreciated.

Dr. Muhammad Masroor Ali

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