Undocumented port in use by VNCviewer in Listen Mode?

Zalman Margareten zmargareten "at" CJH.org
Fri, 31 Aug 2001 17:44:45 +0000


Are u trying to imply that it will establish the connection with port 5400
and then hand it over to 5500? I can understand this with the "regular"
connection that is initiated from the viewer where it will send a sync to
5800 and then establish a connection with 5900. But how do u explain it with
the "listener" method where it starts with 5500 according to my ( netstat -n
readings )?

-----Original Message-----
From: Roy Long [mailto:roy "at" ncitech.com]
Sent: Friday, August 31, 2001 9:46 AM
To: vnc-list "at" uk.research.att.com
Subject: Re: 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?

I believe 5400 is the java web browser port for the viewer, just like 
5800 works for the  java web browser port on the "normal" VNC server.
-- 
Roy Long - KB3CZD
Computer Technician
NCI Technologies
126 N. 2nd Street
Philipsburg PA 16866

roy "at" ncitech.com




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