From owner-freebsd-net@FreeBSD.ORG  Tue Jun 27 21:21:46 2006
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Date: Tue, 27 Jun 2006 23:07:46 +0400
From: "Andrew Pantyukhin" <infofarmer@gmail.com>
To: "Mikhail Teterin" <mi+mx@aldan.algebra.com>
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References: <200606271455.32276.mi+mx@aldan.algebra.com>
Cc: net@freebsd.org
Subject: Re: fetch http://localhost:6666 hangs
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On 6/27/06, Mikhail Teterin <mi+mx@aldan.algebra.com> wrote:
> Hello!
>
> I just noticed, that on my recent "6.1-STABLE #4: Thu Jun  8" amd64 system
> attempts to connect to a bogus port (like 6666) hang instead of failing
> with "Connection refused" immediately, as they on other systems.

My first thought is net.inet.tcp.blackhole sysctl.