Undocumented port in use by VNCviewer in Listen Mode?

Roy Long roy "at" ncitech.com
Fri, 31 Aug 2001 14:50:22 +0000

>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

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

   Version: 3.12
   GO@ d-@ s: a- C++ C--- U+++ P+ L++>$ E--- W+ N+ w
   M++$ PS PE+ PGP+ t+ 5 X R- tv b+ DI++ D G h--- r+++ y--(+++)
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