Re: Telnet tool shutdown

[Jim Langston <jimlangston@xxxxxxxxxxxxxxxx>]

It all depends on what you mean by "Telnet tool".  Are you talking about 
telnet.exe that comes with windows?  That is the actually "Telnet tool",
but when you say an ISP shut down telnet, you are talking about an ISP
shutting off access to port 23.  Which as far as I can tell is completely
ludicrous, since every other port is open through an ISP.

Or are you talking about the ISP shutting off port 23 on their servers?
Lots of ISPs do that, lots of computers don't have port 23 open.

The telnet tool can be used for a lot more than just the telnet port (23).
I play a mud which is on port 2525, I use telnet.  To check the status of
POP3 (110) and SMTP (25) servers.  I have even used it for HTTP (port 80)
and IRC (6000, 7600, etc...).

As far as and ISP shutting down access through port 23 (not to their servers,
but to other servers outside their network I would throw a stinking fit.
No other ports are disabled that way nor should port 23.

A port is just that, a port.  I can put anything I want on port 23 as I can
on any other port.  It is just the standard to put certain services on 
different ports.

I would not blame them for disabling ports 31337 and 12345 though, though
I am fairly sure they would never do that since all the problems that it 
would cause them.  (31337 is BackOrafice, 12345 is Netbus)

Regards,

Jim Langston

Date: Wed, 4 Oct 2000 22:28:00 -0400
From: rgh@us.ibm.com
Subject: Telnet tool shutdown

Booth,
The telnet tool you are talking about is the Microsoft telnet client.  This
client does not negotiate a terminal type when the remote host is an
AS/400.  This generates a VT100 ascii signon for an AS/400.

The named devices support is part of the tn5250e RFC.  This is fully
supported on an AS/400 in a 5250 session.

ISPs usually do not run a telnet server.  There could be some security
holes since a Windows NT has a default profile of Guest that anyone could
use to signon a telnet session, signon as guest and destroy data in Windows
NT.

The AS/400 has user profiles with plenty of object level security to
prevent someone from
getting to data only if they are authorized.

Richard G. Hartmann    e-mail: rgh@us.ibm.com
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