Hello,
There may be a more elegant way to do this under Redhat, but one way of
controlling who may telnet into your machine and who may not is as
follows:
Basically change the shell of users who you would not like to be able to
telnet into your machine (using the chsh <username> command as root). You
could change the shell to /bin/false, which
will print last login information and mail notification and then
disconnect the user (a side affect of this is that the user probably willl
not be able to FTP into your machine using his/her username and password
either although I think you can disable this feature in FTP). You could
also change the user's shell to point to a script which you write that
could do any number of things (such as simply inform the user that they do
not have telnet access, or allow them to change their password if they
like).
I hope this helps, and if you need any clarification let me know.
Ivan Fetch.
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