On 02/24/10 03:32, DRC wrote: > [email protected] wrote: >> I saw this suggested as a means of securing the link: open the ssh >> connection linking the port (eg. 5900) then configuring vncserver to >> only reply to localhost. Thus preventing attempts to connect to >> vncserver from outside the server machine. >> >> ssh -C -X -L 5900:localhost:5900 remotesys.dyndns.info >> >> vncviewer localhost:0 >> >> Isn't that legitimate? > > Yes, OK, I misunderstood. But I'd suggest making it work without SSh > first before adding SSh to the equation. Also, don't use -C. This > enables compression, which is unnecessary, since the image stream is > already compressed (and will greatly slow things down.) > Thanks, that is what I would expect to be the case but without -C it is about an order of magnitude slower! Completely unusable. I had to break the viewer from its command line.
Would that suggest that there is no jpeg compression happening? r...@buntybox:~# vncviewer localhost:0 TigerVNC Viewer for X version 1.0.0 - built Feb 22 2010 16:07:06 Copyright (C) 2002-2005 RealVNC Ltd. Copyright (C) 2000-2006 TightVNC Group Copyright (C) 2004-2009 Peter Astrand for Cendio AB See http://www.tigervnc.org for information on TigerVNC. Wed Feb 24 12:09:43 2010 CConn: connected to host localhost port 5900 CConnection: Server supports RFB protocol version 3.8 CConnection: Using RFB protocol version 3.8 Wed Feb 24 12:09:48 2010 TXImage: Using default colormap and visual, TrueColor, depth 24. CConn: Using pixel format depth 24 (32bpp) little-endian rgb888 CConn: Using Tight encoding ^C Wed Feb 24 12:12:23 2010 main: CleanupSignalHandler called When connected using -C , the F8 window gives me the following: Desktop name x11 Localhost port 5900 Size: 1366 x 1366 Pixel format depth 24 Requested encoding : Tight Line speed estimate 20000 kbits/s Protocol version 3.8 The latter is spurious. I have seen download speeds on that machine touch 300 kB/s but this end of the link is 88kB/s . Even 300Kb/s is an order of magnitude less than the estimate! This may be causing the heuristic compression settings to produce the wrong "optimum". Options shows jpeg quality 8 , Custom compression not checked but showing 6 > >>>> I have three problems: >>>> >>>> 1/ >>>> If I start a vncserver I get communication but a blanc, black desktop >>>> where all I can do is close the tigervnc window. >>> >>> Try completely removing ~/.vnc and start again >> >> Do you mean starting with no xstartup ?? Rerunning make install ? > >> I got two unexpected effects when testing commands form that file >> directly in my ssh console: >> >> xsetroot -solid grey >> >> This command set the background on my local system not the remote where >> it was run. I guess this is due to xforwarding from -X >> >> vncconfig >> No VNC extension on display localhost:14.0 >> >> So it seems vncconfig is not working in this context. > > Those commands are designed to be run on the VNC display, not on any > other display. OK. thanks. vncconfig displays fine in that context. (Have not tested the functionality yet.) > > >>> Display :0? So you are using x0vncserver to do this? I don't fully >>> understand your configuration. >> >> No, Xvnc module setup in /etc/X11/xorg.conf > > Xvnc is the VNC X server. It is designed to establish new "virtual > desktop" sessions apart from the root X server (display :0). The VNC > module is designed to serve a VNC session off of the root display. They > are two different technologies. > > I was mistaken in thinking you were trying to use Xvnc. > Ok , I think I was a bit confused too, I did not realise they were separate entities. I'll put my Xvnc issues to one side until later to focus on getting display:0 to work. Am I right in concluding that the only place options can be set for vnc module is in /etc/X11/xorg.conf ? Here's the relevant section. I am trying to attribute a display name as a tag to that I can verify the file is being read correctly and used. Should I be seeing "display zero" anywhere? The title bar of the vnc window shows "Tigervnc: x11" Section "Module" Subsection "vnc" # Option "Hosts" "127.0.0.1/255.255.255.255" # Option "geometry" "800x600" # Option "depth" "16" Option "localhost" "0" Option "desktop" "display zero" EndSubSection # Load "vnc" EndSection Where do I find the documentation about options to set for the module? I'd been refering to man Xvnc , but it seems to two are not quite the same. http://www.realvnc.com/products/free/4.1/man/Xvnc.html > >> As above, using the above secure shell login on the remote: >> vncviewer localhost:0 >> >> I realised that the black areas are because the remote hardware has a >> 9/16 screen but again I'm having trouble setting -geometry and getting >> it respected. > > You can't use -geometry if you're connecting to the root display, > because it already has a defined geometry. > > Right , this is starting to make more sense to me. The remote system is almost the same height as local one (1024x768) probably the same height without the space taken by the window decoration on vnc, but it's a fair bit wider. Is there a way to display a scaled down version or am I stuck with a 1:1 pixel relation and having to scroll the local vnc window to access all parts of desktop:0? The main objective here is tech. support. It seems my key remaining issue is the compression. Thanks very much for your help. I feel I'm getting somewhere now. best regards. ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Tigervnc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/tigervnc-users
