Telnet connection closes immediately upon connecting

[Kristoffer Knigga]

I just checked /var/log/secure (thanks, Mark) and noticed this:
xinetd[14216]: FAIL: telnet service_limit

What is the default limit on RHEL 4?  I'm not expecting any more than
200 or so connections.

I guess I need to set that "instances = unlimited" option (thanks,
Jack).

Thank you all for your help!

Kris


 

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of m.roth2006 at rcn.com
Sent: Monday, October 15, 2007 3:44 PM
To: General Red Hat Linux discussion list
Subject: Re: Telnet connection closes immediately upon connecting

>Date: Mon, 15 Oct 2007 15:14:13 -0500
>From: "Kristoffer Knigga" <Kknigga at arrow-financial.com>
>Subject: Telnet connection closes immediately upon connecting
<snip>
weekend we
>rolled out a new server with this application and soon after users 
>started hitting it this morning telnetd started dropping new 
>connections as soon as they were made.  By all accounts, existing 
>telnet sessions and ssh were unaffected.
>
>Example:
>$ telnet localhost
>Trying 127.0.0.1...
>Connected to localhost.localdomain (127.0.0.1).
>Escape character is '^]'.
>Connection closed by foreign host.
<snip>
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.

     mark

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