LKML Archive on
help / color / mirror / Atom feed
From: Lawrence MacIntyre <>
Subject: Hung Port
Date: Wed, 17 Jan 2007 10:54:18 -0500	[thread overview]
Message-ID: <> (raw)

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.  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?
  Lawrence MacIntyre   865.574.8696
                Oak Ridge National Laboratory
Cyber Security and Information Infrastructure Research Group

Protect your digital freedom and privacy, eliminate DRM.
Learn more at

             reply	other threads:[~2007-01-17 16:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-17 15:54 Lawrence MacIntyre [this message]
2007-01-17 16:56 ` Jan Engelhardt
2007-01-17 17:39   ` Lawrence MacIntyre

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \
    --subject='Re: Hung Port' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).