telnet to adjacent computer fails

T.C. Hollingsworth tchollingsworth at gmail.com
Mon Mar 5 01:59:30 UTC 2012


On Sun, Mar 4, 2012 at 6:53 PM, Ed Greshko <Ed.Greshko at greshko.com> wrote:
> On 03/05/2012 09:37 AM, Tim Evans wrote:
>> On 03/04/2012 08:35 PM, don fisher wrote:
>>
>>>
>>> What does telnet require that ping does not?
>>
>> A running telnet daemon on the destination host.
>>
>
> Right....
>
> I know this is tangential, but this reminded me of something interesting
> I noticed recently.  I have 2 systems neither running the telnet
> service.  One is a RHELv4 system and the other a F16 system.
>
> Trying to telnet to the RHELv4 system gets "Connection refused" while
> trying to the F16 system gets "No route to host".  Weird.  Will have to
> check into that a bit more when I have the chance.

I'd guess the firewall on the RHEL4 system isn't blocking the
connection, so the connection to port 23 is simply rejected, while the
F16 system's firewall is blocking it, so that system pretends like
it's not there.

-T.C.


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