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Re: Spurious LISTENING ports open during network connections (was Re: Weird Naim.exe network usage?)
- From: <darkacorn at verizon dot net>
- To: <cygwin at cygwin dot com>
- Date: Tue, 28 Oct 2003 1:07:54 -0600
- Subject: Re: Spurious LISTENING ports open during network connections (was Re: Weird Naim.exe network usage?)
Alright then thank you for the new data. I'm not trying to offend you but I just get worried when things are listening on my network you know? I will look into this issue when I have the proper amount of time to address it. Thank you. I was very disappointed with the lack of discussion from the cygwin group so I left it.
> From: Daniel Reed <firstname.lastname@example.org>
> Date: 2003/10/27 Mon PM 12:04:48 CST
> To: email@example.com
> CC: firstname.lastname@example.org
> Subject: Spurious LISTENING ports open during network connections (was Re:
> Weird Naim.exe network usage?)
> On 2003-10-24T15:22-0500, email@example.com wrote:
> ) that for some reason naim.exe was listening on tcp sockets, and not only
> ) that but it changes quite frequently while naim.exe is running. So let me
> ) just state this again, it is listening on TCP sockets. They are also real
> ) because I have confirmed by telneting to them. Nothing is printed or
> ) anything, it just sits there. Has anyone experienced naim.exe listening on
> ) TCP sockets? I have no modules loaded I confirmed with /modlist.
> I was out of town when you first asked about this, and was initially unable
> to reproduce it. However, it does appear that your assessment was correct,
> but it does not appear that this is naim-specific.
> When I start up naim, netstat -a -n -o | grep winpid does not show anything
> (either listening or established). When I /connect, the same netstat now
> shows a connection ESTABLISHED with AOL's servers, and two LISTENING sockets
> on seemingly random ports (one binded to 127.0.0.1, the other allowing
> connections from anywhere).
> However, Cygwin's telnet utility appears to behave identically on my system.
> If I start telnet and run netstat -a -n -o | grep winpid, it does not show
> anything. If I enter "open n.ml.org 80" then immediately I see something
> TCP 0.0.0.0:4705 0.0.0.0:0 LISTENING 2780
> TCP 127.0.0.1:4718 0.0.0.0:0 LISTENING 2780
> TCP 192.168.1.101:4705 188.8.131.52:80 ESTABLISHED 2780
> These LISTENING sockets stay open for the duration of the connection, but
> the 127.0.0.1 port changes after every packet I send out (i.e. it will
> change from 4718 to a higher number after every command I type).
> I am not familiar enough with how the networking code operates, so I am not
> sure what the impact of this might be. It looks like this may be a known
> issue, referenced at http://cygwin.com/ml/cygwin/2000-06/msg00947.html, so I
> do not believe it is a major problem. However, I will defer if another
> Cygwin maintainer has any words of wisdom.
> Daniel Reed <firstname.lastname@example.org> http://naim-users.org/nmlorg/ http://naim.n.ml.org/
> "Murphy's Law is recursive. Washing your car to make it rain doesn't
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