Messages in this thread | | | Date | Wed, 17 Jan 2007 12:39:10 -0500 | From | Lawrence MacIntyre <> | Subject | Re: Hung Port |
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If that was the case, would the port not show up in TIME_WAIT state? Also, the kernel should only hold a closed socket in TIME_WAIT state for 2 minutes or so. These hung ports stay around until the machine is rebooted.
This one time, at band camp, Jan Engelhardt wrote: >> 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'
-- Lawrence MacIntyre 865.574.8696 macintyrelp@ornl.gov Oak Ridge National Laboratory Cyber Security and Information Infrastructure Research Group
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