bug. old bug. but probably nobody reported it yet

[redge]

open ultravnc viewer (listen mode)
then scan yourself with nmap

http://fac.ce.vreau.eu.org/ultravncbug.jpg

Moderated by redge at 2006-03-04 16:03:

moved from Bug rel 1.0.0 to General help, reason, is not a bug

[rmoller]

Working as designed

It is little known, that the VNCviewer can listen at port 5400 for flash purposes. To verify it, start a VNCviewer in listen mode. Then telnet to 127.0.0.1 5400. Whatever you type will appear flashing fullscreen on the viewer PC.

This is inherited from the very first implementation of VNC at Olivetti Research Lab. They had implemented a roaming freeseating, where everyone carried a radio badge of a kind. Whenever they approached a terminal, their current desktop would appear on it (through a winvnc -connect ip adr.). If you were in a room with many PC's you needed a way to identify the PC with your desktop. Hence the "Flasher" listening port at 5400.

Could be used for teasing

[costinel]

looooooooooool
i did not know that. this is annoying, however, if someone wants to block you from working
i expected, though, that the listening socket to be closed or communication ignored when i choose 'toggle listen mode on/off' from the systray icon

[costinel]

is it possible to add an option to make it not listen to 5400 for flash purposes? realvnc does not listen to 5400 by default ....

[redge]

pgmoney made a solution for stop this function

Here is the vnc viewer .exe with the -noflash switch and vc6 source.
(256k download)

http://www.advantig.com/files/vncviewer101a4.zip

Usual disclaimer: Use at your own risk, took 10 minutes to modify and has not had much testing...

source:
Ultra VNC works fine but can't get SC to work

[costinel]

thanks, but i tried accesing the indicated url and i get a 404.
also, googling for "vncviewer101a4.zip" or "vncviewer101a4" gets zero results

[redge]

backup available here
http://www.swiss-adsl.net/redge/vncviewer101a4.exe

[redge]

would be happy to have back the function -noflash for vncviewer