Undocumented port in use by VNCviewer in Listen Mode?

Zoran Pantic kizetoni "at" hotmail.com
Fri, 31 Aug 2001 15:38:23 +0000


In documentation for VNC win server there is a piece of information telling
that Vnc is normally listening to 5900, but also to 5800 (so machine can be
reached via IE, for example typing http:\\ip.add.re.sse:5800).

Zoran


----- Original Message -----
From: "Pete" <pete "at" atdt911.com>
To: <vnc-list "at" uk.research.att.com>
Sent: Friday, August 31, 2001 3:50 PM
Subject: Re: Undocumented port in use by VNCviewer in Listen Mode?


> I've just run a VNC server on a system with a network monitor running and
am
> logged into it from a viewer over the network.
>
> I too see a second port open and listening, but in my case it's 5800. It
> appears to simply be a control-connection. The only time I see any data
> activity on that port is when a connection is established or disconnected.
>
> Hope that settles your fears.
>
> -- Pete Phillips
> -- San Antonio, Texas
>
> ----- Original Message -----
> From: "John Roland Elliott" <John_Roland_Elliott "at" Hotmail.com>
> To: "VNC Mailing List" <vnc-list "at" uk.research.att.com>
> Sent: Friday, August 31, 2001 7:45 AM
> Subject: Undocumented port in use by VNCviewer in Listen Mode?
>
>
> > The documentation indicates that VNCviewer in Listen Mode uses port 5500.
> It
> > appears that when I start VNCviewer in Listen Mode, my machine also
> listens
> > on port 5400, at least my Windows 2000 machine does. After stopping
Listen
> > Mode, both 5500 and 5400 are closed. I have set my firewall to block 5400
> > and allow 5500 and it seems to continue to work.
> >
> > As port 5400 is associated with the Blade Runner Trojan, I was a little
> > alarmed to discover it open on one of my machines.
> >
> > Can anyone provide any illumination on the subject of VNC's use of port
> > 5400?
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