Messages in this thread | | | Date | Wed, 17 Jan 2007 17:56:58 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: Hung Port |
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>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?
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