Undocumented port in use by VNCviewer in Listen Mode?

Pete pete "at" atdt911.com
Fri, 31 Aug 2001 14:54:23 +0000


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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