[rhn-users] Blocking Telnet

[Preston, Gabriel]

This request sounds really familiar, I think someone asked this same
question just a little while ago but I can't seem to find the thread for
that discussion... anyways.
 
If you want to block any incoming traffic from outside your network to that
port, block all incoming connections on port 25.  As for inside your
network, a software based firewall on the server can be setup to block all
incoming connections on port 25.  These are ways to block access.
 
Depending on your mail server, you can also set it up to disallow any
relaying and only permit access from certain IPs, or from authenticated
users.
 
I guess what it all comes down to though is... What reasons exactly are you
trying to block/secure this from telnet for?
 
If you are just simply trying to block telnet and not people from
receiving/sending their email through the server, that can't be done.  Your
mail server doesn't recognize the difference between a telnet session and a
mail client.
 
Sorry if these seems somewhat disjointed.  It is early on a Monday morning
and I'm not fully functional yet.
 
-gabriel
 
-----Original Message-----
From: rhn-users-bounces at redhat.com [mailto:rhn-users-bounces at redhat.com] On
Behalf Of jijo john
Sent: Sunday, March 06, 2005 7:17 AM
To: sendmail+faq at Sendmail.ORG
Cc: rhn-users at redhat.com
Subject: [rhn-users] Blocking Telnet 
 
  
Hai

I am using Fedora core 1
I want to block telneting to smpt port
how can I block or secureing my telnet port from outside network and
inside network

thanks
jijo's


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