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Date:      Fri, 30 May 2008 20:12:41 +1000
From:      Peter Jeremy <peterjeremy@optushome.com.au>
To:        Robert Blayzor <rblayzor.bulk@inoc.net>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: Sockets stuck in FIN_WAIT_1
Message-ID:  <20080530101241.GS1028@server.vk2pj.dyndns.org>
In-Reply-To: <A1459A8E-3615-4C26-A622-AE068B638373@inoc.net>
References:  <483EAED1.2050404@FreeBSD.org> <200805291912.m4TJCG56025525@apollo.backplane.com> <14DA211A-A9C5-483A-8CB9-886E5B19A840@inoc.net> <200805291930.m4TJUeGX025815@apollo.backplane.com> <0C827F66-09CE-476D-86E9-146AB255926B@inoc.net> <200805292132.m4TLWhCv026720@apollo.backplane.com> <CCBAEE3E-35A5-4BF8-A0B7-321272533B62@inoc.net> <20080530081143.GI1028@server.vk2pj.dyndns.org> <20080530084724.GA37672@walton.maths.tcd.ie> <A1459A8E-3615-4C26-A622-AE068B638373@inoc.net>

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On 2008-May-30 05:35:56 -0400, Robert Blayzor <rblayzor.bulk@inoc.net> wrot=
e:
>A timeout value would be fine.

The problem is selecting a sensible timeout - 30-60s might be reasonable
for a webserver that serves static content but is a bit short for a shell
session...

>On a side note, I could easily fix this problem by frontending the server=
=20
>with a Cisco PIX or ASA.  I believe they have "half closed" timers just fo=
r=20
>this purpose... Perhaps a kernel tunable knob would be a nice=20
>option/fix/hack also.

I don't think your problem is related to half-closed connections.  You
would get exactly the same behaviour if the server didn't close its
end of the connection.  OTOH, a long-lived half-closed connection is
perfectly valid - many years ago, I wrote a tool that logged data in
one direction only and so closed the other direction.

I agree that a kernel tunable would be nice but I'm not in a position
to write a suitable patch at present.

--=20
Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.

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