HOWTO: Set up VNC server with resumable sessions

[mpadams]

1. Add "flags = IPv6" to the x11vnc file.

2. Restart xinetd if needed.

3. Use the IPv6 TightVNC viewer (free) or RealVNC 4.1 (pay) to access it. Not sure what other Linux or Windows clients support IPv6 at this time.

http://jungla.dit.upm.es/~acosta/paginas/vncIPv6.html
http://www.realvnc.com/products/ente.../4.1/ipv6.html

Reference: "IPv6 in Practice" http://www.benedikt-stockebrand.de/books_e.html

[beengone]

Running Xubuntu 7

for step 4:
Add vnc service to xinetd:
Code: sudo gedit /etc/xinetd.d/Xvnc

I get errors.

Warning: unknown mime-type for "/etc/xinetd.d/Xvnc" - - using "application/*"
Error: now write permission for file "/etc/xinetd.d/Xvnc"


Any idea how to fix this?

[hobs0n]

First I wanna say: Thank you for making this great newb helping guide thread

My problem is: when I run the test you said "vncviewer localhost:1" it says: "ReadFromRFBServer: rdr::SystemException: read: Connection reset by peer (104)"


I followed your guide and did all as you said but I couldnt find the "enable xdmcp" options. Im running latest Xubuntu so I guess the xdmcp options isnt where it says it is in your guide?

[hotani]

hobs0n: the "enable xdmcp" option is not there. Instead of marking a checkbox for it, go into the 'login window' prefs and under the 'remote' tab, set it to 'simple' which should do the same thing.

Also, I had the same problem when trying to run locally. use "localhost:5900" or whatever port you are using instead of "localhost:1" which did it for me.

[hobs0n]

Ok, I started the "login window" app and the remote tab, I found no simple, my options was: same as local, plain, plain with face browser. I guess instead of simple its called plain? I selected plain and connected to my port that was 5901, still get the same "ReadFromRFBServer: rdr::SystemException: read: Connection reset by peer (104)" error. What am I doing wrong?

[hotani]

right - sorry, it is 'plain' and not 'simple', i'm getting my control panels mixed up.

As for the error, I'm not sure what is causing that. Do you have the vnc port open on the machine? And is the xinetd server awaiting connections (via the Xvnc script in the howto)?

[hobs0n]

I rechecked the howto and found nothing wrong what I have done, altho when I read deeper in the thread I found when I ran "grep xinetd /var/log/syslog" as Tichondrius said I get HEAPS of error messages :

"Jul 2 17:30:42 vargtass-server xinetd[7572]: warning: can't get client address: Transport endpoint is not connected
Jul 2 17:30:42 vargtass-server xinetd[7573]: warning: can't get client address: Transport endpoint is not connected
Jul 2 17:30:42 vargtass-server xinetd[7191]: Deactivating service Xvnc due to excessive incoming connections. Restarting in 10 seconds.
Jul 2 17:30:52 vargtass-server xinetd[7191]: Activating service Xvnc"

Earlier in the log file it shows:

"Jul 2 17:28:10 vargtass-server xinetd[7191]: Reading included configuration file: /etc/xinetd.d/time [file=/etc/xinetd.d/time] [line=26]
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing chargen
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing chargen
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing daytime
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing daytime
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing discard
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing discard
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing echo
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing echo
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing time
Jul 2 17:28:10 vargtass-server xinetd[7191]: removing time
Jul 2 17:28:10 vargtass-server xinetd[7191]: xinetd Version 2.3.14 started with libwrap loadavg options compiled in.
Jul 2 17:28:10 vargtass-server xinetd[7191]: Started working: 1 available service
Jul 2 17:28:57 vargtass-server xinetd[7207]: warning: can't get client address: Transport endpoint is not connected"

Might this be that it isnt listening to the port??

EDIT: I add the I just restarted the machine which didnt help, I also want to say that in the Post in this page, Tichondrius said: "sudo Xvnc :2 -query localhost -geometry 1280x1024 -depth 16 -once -fp /usr/share/X11/fonts/misc -DisconnectClients=0 -NeverShared passwordFile=/root/.vncpasswd" and I tried that and it said: "Unrecognized option: -DisconnectClients=0" and I tried to remove that option and then it said that command was wrong and I tried remove more options but I gave it up.

Might this be that my VNC server is wrong or that its a different version? How can I check what version I got?

EDIT2: Hpw do I check if my machine has that port open?

[bouzzi]

HI
I have the french 7.04 Feisty Fawn version of Ubuntu and I cannot figure how to get to this part of your steps :

1. Enable XDMCP
System->Administration->Login Screen Setup
Tab Security->Enable XDMCP
Tab XDMCP--> You can disable "Honor Indirect Requests"

When I get there, I don't see nothing about XDMCP...

Is there an other way to enable XDMCP?

In a config file ???? maybe ?

For each other steps, I worked well... I think

But in vncviewer I get a grey screen with X cursor giving me nothing to do but moving it...

Thanx

Bouzzi

[prostock3]

I just used this tutorial to install vnc4, and my friend gt onto a session without pass word or login

He pointed me to this demo of how to break in:

http://hydrogen.oshean.org/vnc-exploit.htm

And told me to upgrade my version. What security precautions do you guys recommend for vnc?


Thanks.

[hotani]

HI
I have the french 7.04 Feisty Fawn version of Ubuntu and I cannot figure how to get to this part of your steps :

1. Enable XDMCP
System->Administration->Login Screen Setup
Tab Security->Enable XDMCP
Tab XDMCP--> You can disable "Honor Indirect Requests"

When I get there, I don't see nothing about XDMCP...

Is there an other way to enable XDMCP?

In a config file ???? maybe ?

Go to Administration -> Login Window -> Remote tab -> style: "plain"

For each other steps, I worked well... I think

But in vncviewer I get a grey screen with X cursor giving me nothing to do but moving it...

Thanx

Bouzzi

A reboot cleared the gray screen problem for me.