Telnet connection closes immediately upon connecting

Geofrey Rainey Geofrey.Rainey at
Mon Oct 15 20:57:47 UTC 2007

I've seen this exact result too from a transparent proxy sitting in the
way - though
The output looked as though the TCP packets were reaching the server, it
was the
Transparent proxy doing it.

-----Original Message-----
From: redhat-list-bounces at
[mailto:redhat-list-bounces at] On Behalf Of Gaddis, Jeremy L.
Sent: Tuesday, 16 October 2007 9:53 a.m.
To: General Red Hat Linux discussion list
Subject: Re: Telnet connection closes immediately upon connecting

On 10/15/07, m.roth2006 at <m.roth2006 at> wrote:
> Looks to me as though someone has shut down or firewalled telnet, to
block new incoming connections. I'd want to look at the logs on the
host, both messages and secure.

If that were the case, the server would never respond to the initial
SYN, preventing the connection from ever being established.

I'd look a bit more closely at my TCP wrappers configuration,
Kristoffer.  This is exactly the result you'll see if TCP wrappers is
preventing the connection.

Jeremy L. Gaddis

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