linux-kernel - Re: Hung Port

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Date:	Wed, 17 Jan 2007 17:56:58 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Lawrence MacIntyre <macintyrelp@...l.gov>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Hung Port


>Last week I had a port (TCP:52557) that was mysteriously unavailable on
>my ubuntu machine (running kernel 2.6.15-27-k7 #1 SMP PREEMPT).  If you
>tried to bind to it, it was unavailable.  However, nmap (both to
>localhost and from an external host) reported the port closed.  fuser,
>lsof, and netstat had no record of the port being used.

Did your application forgot to set SO_REUSEADDR?

>  Our firewall
>logs didn't show any unusual traffic to the machine.  Nor did they show
>any traffic at all to/from that port on the machine.  After checking
>everything I could think of, I rebooted it, and there were no ports that
>were unavailable in this way when it came back up.  This morning another
>hung port has appeared (TCP:43355).  My best guess is that this is an
>ephemeral port that has somehow gotten hung in the kernel somewhere.
>Has anyone seen anything like this and/or is there anything else I could
>look at to figure it out?

	-`J'
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