[K12OSN] tight vnc connection to ltsp client refused (111 error)

Trond Mæhlum trond at maehlum.net
Sat May 20 16:55:05 UTC 2006

Eric Harrison skrev:
> Robert Arkiletian wrote:
>> On 5/19/06, Trond Mæhlum <trond at maehlum.net> wrote:
>>> Robert Arkiletian skrev:
>>>> On 5/17/06, Dan Visentin <visentind at hdsb.ca> wrote:
>>>>>  Howdy Folks,
>>>>>  I've been experimenting with Fl_TeacherTool (brilliant Rob!) but
>>> cannot
>>>>> monitor the LTSP clients.  I cannot even use the vncviewer to view
>>>>> clients.
>>>>> In all cases I get a "connection refused (111)" error.  I've run
>>>>> vncpasswd
>>>>> and copied files etc. as per instructions but to no avail.
>>>> What version of k12ltsp are you using? k12ltsp 5.0 does not work with
>>>> the monitor/control feature of fl_TT because there is no vnc X
>>>> extension module compiled in the LBE. I developed fl_TT using k12ltsp
>>>> 4.2.1EL. Although NO version of k12ltsp has the required module
>>>> compiled in the LBE, out of sheer luck the required files when copied
>>>> from the host OS seem to work in 4.2.1EL. That's why I labeled them
>>>> experimental.
>>> Robert and Dan,
>>> This also works on K12LTSP 4.4.x. It seems that it will work on all
>>> installations of LTSP4.1 that I have tried. Sadly, it does not work on
>>> LTSP4.2 for now. I am one of many (I think) that will not let go of this
>>> feature.
>>> I have tried it on the new Ubuntu and Skolelinux ltsp as well. I would
>>> suspect it to be much easier when you can chroot into the ltsp-tree and
>>> apt-get install vnc4server. Sadly I haven't been able to get it working
>>> there either. There's too many changes in ltsp, so the how-to doesn't
>>> apply to get the vncserver started at login on the terminal.
>> Hopefully Eric or Jim will provide an rpm to add the necessary
>> libraries to the LBE, if enough people request it.
>> Fl_TT is useful for more than just teachers. Perhaps Jim will decide
>> to add it to LTSP as it does provide a solution for some of the
>> desired future functionality of LTSP's roadmap. eg broadcasting,
>> shadowing, etc
> I managed to build a working binary. Still much work to do in order to
> package it up & provide patches for Jim & the LTSP crew.
> But for those of you who want to test it out, here is the
> quick-and-dirty instructions:
> =============================================================
> 4.  Optional: Step 4 is only required to enable the experimental support
>         to Monitor and Control.
>         Edit the file /opt/ltsp/i386/etc/lts.conf
>         Fine the line X4_MODULE_01=glx and change it to:
>         X4_MODULE_01 = vnc
>         Then edit the file /opt/ltsp/i386/etc/build_x4_cfg
>         and add the following between (Secton "Screen") and
>         (EndSubSection), so it looks
>         like this:
>      Section "Screen"
>           Identifier "Screen0"
>           Device "My Video Card"
>           Monitor "My Monitor"
>           DefaultDepth  ${X_COLOR_DEPTH:-16}
>           Subsection "Display"
>                   Depth ${X_COLOR_DEPTH:-16}
>                   Modes ${MODE[*]}
>      #=========================================
>      # Added to enable Monitor/Control in Fl_TeacherTool
>                    Option "httpdir" "/usr/share/vnc/classes"
>                   Option "PasswordFile" "/root/.vnc/passwd"
>                   Option "rfbport" "5900"
>                   Option "usevnc"
>      #=========================================
>           EndSubSection
>      EndSection
>     Now you'll have to make a password for the vnc-session. Run this
>     command as root:
>     #/usr/bin/vncpasswd
>     Choose a password and copy the password file into the ltsp-tree
>     #cp -R -p /root/.vnc /opt/ltsp/i386/root/
>     Now you must copy the vnc-module into the ltsp-tree:
>     # cd /opt/ltsp/i386/usr/X11R6/lib/modules/extensions/
>     # wget ftp://k12linux.mesd.k12.or.us/pub/vnc-for-ltsp42/vnc.so
>     Reboot the clients and the new Monitor/Control buttons in
>     Fl_TeacherTool should work.

EXCELLENT! :) Can't wait to try this out on monday.


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