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Old 08-23-2008, 02:02 PM
 
Default Edubuntu Remote Desktop Issue

I am a consultant*volunteering some time*with a non-profit private school.* This school is investigating using Edubuntu instead of a Microsoft environment.*
**
Since hardware availability is an issue for them, I have created three Edubuntu workstations on*one of my*Virtual Servers, with an offer to create up to two more. It was my intention to have their evaluation committee use a free VNC viewer on their Windows workstations to remotely access these Edubuntu workstations, whether at school or at their leisure from home.* From a volunteer support point of view, if they trash an Edubuntu workstation, I can rebuild from home at my convenience if necessary.* Two weekends ago, I downloaded the latest stable version of Ubuntu Workstation, and the Edubuntu add-on.* I successfully created three virtual Edubuntu workstations in VMWare, enabled Remote Desktop, and I could access the workstations remotely through the latest version of the Real VNC viewer.* To get this to work originally, I discovered that I had to check the "Require Encryption" and save configuration, then uncheck
"Require Encryption" and save the configuration.* It was as if the "Require Encryption" requirement was set by default, but was not displayed correctly in the configuration panel.
*
Last weekend, I had to move the physical VMware server to its original location, and everything was shutdown gracefully, including all VM's.* When I powered back up, I could no longer connect the the Edubuntu workstations, and I cannot find any way to get them to work now.* According to the RealVNC website, the error I am receiving is related to the VNC server wanting to secure the session.* The free version of VNC viewer does not encrypt the session, and for this testing, encryption is not required.*
*
Since I could not find any firewall or configuration issue preventing access, and having made certain all three Edubuntu workstations did not have the*"Require Encryption" check box enabled, I created a new Edubuntu VM.* Here are the results.
*
1: Installed Ubuntu Workstation 9 2.6.24-19-generic
** Windows based VNC Clients work with this configuration.
2: Installed Edubuntu add-in, no reboot
** Windows based* VNC Clients work with this configuration.
3: Rebooted Edubuntu Workstation
** Windows based* VNC Clients DO NOT work with this configuration.
4: Fully patched (107 files downloaded)
** Windows based*VNC Clients DO NOT work with this configuration.
*
I have even tried the original fix of checking then unchecking the "Require Encryption" advanced option.

*
I had posted this issue on ubuntuforums, but have had zero response.* I am hoping to get this school started on their evaluation so that tehy can make a properly informed decision for the 2009 Fall start.
*
http://ubuntuforums.org/showthread.php?t=892823
*
Any help would be appreciated.
Thank you.
Randy Baker--
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Old 08-23-2008, 03:42 PM
Gavin McCullagh
 
Default Edubuntu Remote Desktop Issue

Hi,

On Sat, 23 Aug 2008, randy.baker@rogers.com wrote:
*
> Last weekend, I had to move the physical VMware server to its original
> location, and everything was shutdown gracefully, including all VM's.*
> When I powered back up, I could no longer connect the the Edubuntu
> workstations, and I cannot find any way to get them to work now.*
> According to the RealVNC website, the error I am receiving is related to
> the VNC server wanting to secure the session.* The free version of VNC
> viewer does not encrypt the session, and for this testing, encryption is
> not required.*
>
> Since I could not find any firewall or configuration issue preventing
> access, and having made certain all three Edubuntu workstations did not
> have the*"Require Encryption" check box enabled, I created a new Edubuntu
> VM.* Here are the results.
>
> 1: Installed Ubuntu Workstation 9 2.6.24-19-generic
> ** Windows based VNC Clients work with this configuration.
> 2: Installed Edubuntu add-in, no reboot
> ** Windows based* VNC Clients work with this configuration.
> 3: Rebooted Edubuntu Workstation
> ** Windows based* VNC Clients DO NOT work with this configuration.
> 4: Fully patched (107 files downloaded)
> ** Windows based*VNC Clients DO NOT work with this configuration.
>
> I have even tried the original fix of checking then unchecking the
> "Require Encryption" advanced option.

You say Windows-based VNC clients don't work. Do Linux-based VNC clients
work? It wouldn't be a solution, but it might be useful to help understand
the problem. Also, have you tried any other windows-based VNC clients?

Have you tried manually starting the vino vnc server from the command line?
There's some interesting stuff here on how to control vino a little better:

http://ubuntuforums.org/showthread.php?t=266981

You could also (as a workaround), try installing vnc4server and starting it
from the command line. That might help get you going.

Gavin


--
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edubuntu-users@lists.ubuntu.com
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Old 08-23-2008, 05:24 PM
"Cameron Tully-Smith"
 
Default Edubuntu Remote Desktop Issue

To Gavin's point on VNC clients: I've seen strange behavior with RealVNC; I'd suggest Tight VNC.


On 8/23/08, Gavin McCullagh <gmccullagh@gmail.com> wrote:
Hi,

On Sat, 23 Aug 2008, randy.baker@rogers.com wrote:


> Last weekend, I had to move the physical VMware server to its original
> location, and everything was shutdown gracefully, including all VM's.
> When I powered back up, I could no longer connect the the Edubuntu

> workstations, and I cannot find any way to get them to work now.
> According to the RealVNC website, the error I am receiving is related to
> the VNC server wanting to secure the session.**The free version of VNC

> viewer does not encrypt the session, and for this testing, encryption is
> not required.
>
> Since I could not find any firewall or configuration issue preventing
> access, and having made certain all three Edubuntu workstations did not

> have the "Require Encryption" check box enabled, I created a new Edubuntu
> VM.**Here are the results.
>
> 1: Installed Ubuntu Workstation 9 2.6.24-19-generic
> ** Windows based VNC Clients work with this configuration.

> 2: Installed Edubuntu add-in, no reboot
> ** Windows based**VNC Clients work with this configuration.
> 3: Rebooted Edubuntu Workstation
> ** Windows based**VNC Clients DO NOT work with this configuration.

> 4: Fully patched (107 files downloaded)
> ** Windows based VNC Clients DO NOT work with this configuration.
>
> I have even tried the original fix of checking then unchecking the
> "Require Encryption" advanced option.


You say Windows-based VNC clients don't work.**Do Linux-based VNC clients
work?**It wouldn't be a solution, but it might be useful to help understand
the problem.**Also, have you tried any other windows-based VNC clients?


Have you tried manually starting the vino vnc server from the command line?
There's some interesting stuff here on how to control vino a little better:

http://ubuntuforums.org/showthread.php?t=266981


You could also (as a workaround), try installing vnc4server and starting it
from the command line.**That might help get you going.

Gavin


--
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Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users


--
Cameron Tully-Smith

Software and Systems Integration
cameron.tullysmith@gmail.com
707-321-8029 (cell)
http://www.linkedin.com/in/camerontullysmith
--
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Old 08-23-2008, 06:08 PM
 
Default Edubuntu Remote Desktop Issue

Hi Gavin:
*
The Windows Based VNC clients I have tried include:
*
Real VNC Viewer Free Edition 4.1.2
Tight VNC Viewer 1.3.9

I typically use Real VNC, and that is the VNC Viewer that I had successfully connected to the Edubuntu workstations prior to the move.* It was also the Real VNC viewer I used to confirm that I could connect to the Ubuntu workstation, but could not connect to the same system with the Edubuntu add-ons.*
*
The specific error message is "No matching security types, Do you wish to attempt to reconnect to 192.168.1.104:0?"
*
On the network side, the IP address is statically assigned, and the VM is configured with a bridged virtual network interface.**All Edubuntu workstations are configured similarily, and can connect to each other and the Internet without any problem.
*
Ubuntu/Edubuntu based Remote Desktop Clients can successfully connect to the other Edubuntu workstations.
*
When I uncheck "allow other users to use your desktop", netstat shows that port 5900 is still available.* However, the Remote Desktop Viewer on the other Edubuntu workstations can no longer*see the disabled Edubuntu workstation using the "Find" button.* *I used the following command to identify what*process and executable*is associated with the port.
*
$ netstat -l -np -p | grep 5900
*
That returned 5653/ica.
*
Checking the process list, there are three processes associated with ica, and I am able to kill those three processes.* However, when I
check netstat, port 5900 remains open with 5653/ica, and I still get the security types error.* I don't know what process to kill, and I am unclear whether this Remote Desktop is a Vino server.* I understand there are currently some problems with Vino.
*
I did follow the instructions in the link you provided, but that also did not work.
*
I have downloaded a Real VNC server for this workstation, but at this point I don't know what process to kill to remove Remote Desktop.
*
I have also checked to see if iptables is running.* I do not see iptables in the process list, but iptables -V returns v1.3.8,, and iptables -L returns three chains with no rules.* Just to be safe, I added the following rule:
*
sudo iptables -A INPUT -p tcp -m tcp --dport 5900 -j ACCEPT
*
I have installed vnc4server as per your e-mail, but I cannot start it up as screen 0 since the other VNC server has the screen.* I cannot kill the :0 server with vncserver.* I can start up vncserver with other screens, but I only get a simple X window.

Any help is appreciated.
Thank you.
Randy
*
----- Original Message ----
From: Gavin McCullagh <gmccullagh@gmail.com>
To: edubuntu-users@lists.ubuntu.com
Sent: Saturday, August 23, 2008 11:42:47 AM
Subject: Re: Edubuntu Remote Desktop Issue

Hi,

On Sat, 23 Aug 2008, randy.baker@rogers.com wrote:
*
> Last weekend, I had to move the physical VMware server to its original
> location, and everything was shutdown gracefully, including all VM's.*
> When I powered back up, I could no longer connect the the Edubuntu
> workstations, and I cannot find any way to get them to work now.*
> According to the RealVNC website, the error I am receiving is related to
> the VNC server wanting to secure the session.* The free version of VNC
> viewer does not encrypt the
session, and for this testing, encryption is
> not required.*
>
> Since I could not find any firewall or configuration issue preventing
> access, and having made certain all three Edubuntu workstations did not
> have the*"Require Encryption" check box enabled, I created a new Edubuntu
> VM.* Here are the results.
>
> 1: Installed Ubuntu Workstation 9 2.6.24-19-generic
> ** Windows based VNC Clients work with this configuration.
> 2: Installed Edubuntu add-in, no reboot
> ** Windows based* VNC Clients work with this configuration.
> 3: Rebooted Edubuntu Workstation
> ** Windows based* VNC Clients DO NOT work with this configuration.
> 4: Fully patched (107 files downloaded)
> ** Windows based*VNC Clients DO NOT work with this configuration.
>
> I have even tried the original fix of checking then unchecking the
>
"Require Encryption" advanced option.

You say Windows-based VNC clients don't work.* Do Linux-based VNC clients
work?* It wouldn't be a solution, but it might be useful to help understand
the problem.* Also, have you tried any other windows-based VNC clients?

Have you tried manually starting the vino vnc server from the command line?
There's some interesting stuff here on how to control vino a little better:

http://ubuntuforums.org/showthread.php?t=266981

You could also (as a workaround), try installing vnc4server and starting it
from the command line.* That might help get you going.

Gavin


--
edubuntu-users mailing list
edubuntu-users@lists.ubuntu.com
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
--
edubuntu-users mailing list
edubuntu-users@lists.ubuntu.com
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
 

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