RE: vnc server running in a citrix connection

2012-05-16 Thread Long, Phillip GOSS
-Original Message-
From: Adam Hobaugh [mailto:vnc-list@realvnc.com] 
Sent: Tuesday, May 15, 2012 9:39 AM
To: Long, Phillip GOSS
Subject: Re: vnc server running in a citrix connection

Thank you for your response. The way that they have it set up is on 
the remote desktop she gets with citrix, the first thing she must 
do is start a vnc server on that desktop so they can use the veiwer 
to see the remote desktop. If the remote desktop has a modified 
version of the server on it. Would it be able to somehow see her 
desktop on her local machine? I am not sure if it is possible for 
the server to hop onto the citrix connection and see her laptops 
desktop as well as the remote one.

//adam

--

Adam: Assuming that the VNC server at your friend's workplace is 
compiled from standard code, she need not worry that her employer 
can 

snip



Adam:

Not having used Citrix, I can't say for sure, but I'll venture a 
guess that the Citrix RDP client works much like others, in that it 
creates local windows and controls controlled by the remote server, 
instead of serving up all remote screen data like VNC does.  The 
VNC server on the Citrix-connected remote desktop could very well 
be modified to snoop on the Citrix RDP data stream, but since that 
data could at best only show what your friend sees in the Citrix 
RDP client (i.e., the remote desktop), it wouldn't buy them 
anything.  The Citrix RDP client is proprietary, and I think it 
unlikely that her employer would be willing to pay for a modified 
version that could snoop her desktop (or even that Citrix would be 
willing to do so).  Besides the probable high price of any such 
modification, it's even more unlikely that Citrix would be willing 
to keep upgrading the customized version along with the standard 
one.  I have been in that situation before; the vendor modified 
their OS for us, but refused to keep it current, which meant that 
the machine on which it ran soon became a dinosaur.  We were 
willing to accept that because of our special circumstances, but 
very few software customers would be willing to pay that price.

HTH!

Thx, Phil Long
 


Goss ... Innovation for Business

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RE: Ubuntu with Xvnc to :1 with no window manager at :0

2012-05-16 Thread Long, Phillip GOSS
-Original Message-
From: Mike Miller [mailto:mbmil...@gmail.com] On Behalf Of Mike Miller
Sent: Tuesday, May 15, 2012 11:35 AM
To: Long, Phillip GOSS
Cc: VNC List
Subject: RE: Ubuntu with Xvnc to :1 with no window manager at :0

On Mon, 14 May 2012, Long, Phillip GOSS wrote:

 On Wed, 25 Apr 2012, Mike Miller wrote:

snip

Thanks, Phillip.  On my system, it seems that 
/etc/X11/xinit/xinitrc calls /etc/X11/Xsession and there is no 
~/.xinitrc file.

Suppose I make it so that /etc/X11/xinit/xinitrc doesn't start X11. 
 I guess I would then see a console window after booting.  Can I 
just run vncserver :1, say, from there, then run vncviewer from 
that console?  It just seems like that would fail because I don't 
have a graphical interface.  How can vncviewer run without a 
DISPLAY?

By the way, I have been running Xvnc on :1 for years without any 
failures (that's RealVNC Free).  It ran once for something like 500 
days on Solaris.  It's really the same on Ubuntu -- no failures -- 
but I happen to have the machine in a place where the power 
sometimes goes out and that has limited me to only about 200 days 
of uninterrupted uptime.

Mike



Mike:

Once again, I have to emphasize that I am *not* an expert, nor have 
I ever used Xvnc, so I'm just going by what I have ready over the 
years; unfortunately, I can't tell U off-hand where I happened to 
read these things, other than to say that it was most likely on the 
RealVNC website.

I poked around on the RealVNC website a bit, and on the page
 
http://kb.realvnc.com/questions/10/How+do+I+run+multiple+screens%7B47%7D
sessions+of+VNC%3F
it says that there is an X server built into the vncserver.  It 
also shows one case in which U want to have more than one X server 
(running one or more copies of vncserver).  In fact, much to my 
surprise, it also shows that U can attach vncserver to an 
already-existing X server.  I didn't know U could do that!

vncserver is an X server, with its own display; U work with it 
by setting the DISPLAY environment variable to the appropriate 
value (:1, :2.0, :0.1, etc.), just like U do with X11.  It will 
work with your default window manager, or U can use a different one 
(changed in ~/.vnc/.something-or-other).  If U modify xinitrc, U 
would change it to launch vncserver instead of X; as a general 
rule, I try Really Hard not to change system-wide stuff, but in 
this case, I'm not sure how to implement Xvnc in user-mode.  If my 
understanding is correct, your X server would then be running on 
display :0.0.  Since this would be a system-wide change, all users 
on the system would experience this change.  So long as they 
interact with the X server using their window manager (which 
everybody does), they probably wouldn't notice any change (any 
differences would probably mean that one X server or the other had 
a bug, or was making an alternate assumption about something).  
Running vncserver as your primary X server would have the 
advantage of allowing anybody who connected your machine to see 
your desktop, just like it works on MSWindows; of course, working 
like MS Windows is not always seen as an advantage!

Thx, Phil Long
 


Goss ... Innovation for Business

NOTICE: This e-mail and any attachment(s) may contain confidential and 
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the addressee. If you are not the addressee, dissemination, copying or other 
use of this e-mail or any of its content is strictly prohibited and may be 
unlawful. If you are not the intended recipient please inform the sender 
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excluded to the fullest extent permitted by law. Any views expressed in this 
message are those of the individual sender. No contract may be construed by 
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