>Simple answer... YES!
>
>> can I edit the /etc/services file and change the port number manually?
>> Is
>> this possible.
Longer answer...
Yes you could edit the port number next to telnet in /etc/services and this
would work, assuming that your telnet daemon is run beneath tcpwrappers (as
every distribution i've seen does it). After changing the number you need
to hup inetd.
This isn't really a security enhancement. If you want to restrict access
to telnet make use of tcpwrappers. I won't delve into this now other than
to direct you to /etc/hosts.deny and /etc/hosts.allow and man tcpd which
should give you enough of a start to ask questions as necessary.
Several people have suggested that you install sshd. This is a Good Thing.
I'm not that paranoid about security on my home machine but ssh is no less
convenient than telnet and increases security dramatically. The ssh daemon
can be run as standalone or called by tcpd and it's quite simple to install
so there's really no excuse not to do so if you're at all interested in
security. Telnet access to my machine is only permitted from a couple of
locations in the event that ssh isn't quickly available. This is unlikely
given that most machines i operate on have ssh on them and even the NT
boxen have 1, 2 or even 3 ssh clients on them.
If you want a free ssh client for a windows machine then check out PuTTY,
which is freely available for use and distribution from
http://www.chiark.greenend.org.uk/~sgtatham/putty/ It's open source too,
which struck me as odd purely because it's windows software. it handles
telnet and ssh and this is quite a good program, and while it's not as
complete as f-secure or securecrt (which i prefer) it's certainly a hundred
steps above that bastard windows telnet.exe which doesn't actually
implement the telnet protocol properly. yes, it is not capable of adhering
to the standard way to send readable text across a network. disgusting
(hehe).
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