[clue-tech] how do I get gnome desktop to host x sessions from remote servers?

[David Williams]

Thanks Bruce,

This seems reasonable but so far no luck.

On the desktop I run the following:
  davidw at atContact-ubuntu:~$ xhost +
  access control disabled, clients can connect from any host
  davidw at atContact-ubuntu:~$ xhost
  access control disabled, clients can connect from any host
  SI:localuser:davidw
  davidw at atContact-ubuntu:~$ 


On the server (the x-client side) I run:
  [davidw at callisto davidw]$ export DISPLAY=192.168.1.133:0.0
  [davidw at callisto davidw]$ echo $DISPLAY
  192.168.1.133:0.0
  [davidw at callisto davidw]$ xhost $DISPLAY
  xhost:  unable to open display "192.168.1.133:0.0"
  [davidw at callisto davidw]$ xterm 
  xterm Xt error: Can't open display: 192.168.1.133:0.0
  [davidw at callisto davidw]$ /sbin/ifconfig eth0
  eth0      Link encap:Ethernet  HWaddr 00:0C:76:16:D5:C5  
            inet addr:192.168.1.5  Bcast:192.168.1.255  Mask:255.255.255.0
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:2883192 errors:0 dropped:0 overruns:0 frame:0
            TX packets:1730640 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:100 
            RX bytes:330867282 (315.5 Mb)  TX bytes:475892523 (453.8 Mb)
            Base address:0xa400 Memory:e2000000-e2020000 

  [davidw at callisto davidw]$ sudo ping -c 2 -Ieth0 192.168.1.133
  PING 192.168.1.133 (192.168.1.133) from 192.168.1.5 eth0: 56(84) bytes of data.
  64 bytes from 192.168.1.133: icmp_seq=0 ttl=64 time=0.446 ms
  64 bytes from 192.168.1.133: icmp_seq=1 ttl=64 time=0.372 ms

  --- 192.168.1.133 ping statistics ---
  2 packets transmitted, 2 received, 0% packet loss, time 1000ms
  rtt min/avg/max/mdev = 0.372/0.409/0.446/0.037 ms, pipe 2


So, I must be missing something.
I don't think I have a NAT issue as things work fine when I reboot in Windows, and we are on the same subnet (client and server).
Is there a firewall on Ubuntu?  If so how do I configure it and for what port?

Thanks,
-David

--- On Thu, 10/8/09, Bruce Ediger <bediger at inlumineconsulting.com> wrote:

> From: Bruce Ediger <bediger at inlumineconsulting.com>
> Subject: Re: [clue-tech] how do I get gnome desktop to host x sessions from remote servers?
> To: dkwloki-clue at yahoo.com, "CLUE technical discussion" <clue-tech at cluedenver.org>
> Date: Thursday, October 8, 2009, 10:49 AM
> On Thu, 8 Oct 2009, David Williams
> wrote:
> 
> > When I run an X using application on my server I get:
> > Gtk-WARNING **: cannot open display:
> > 
> > I have exported my DISPLAY variable and this works
> fine for Windows but not Linux.
> 
> The X server has to (a) listen for connections on well
> known TCP port 6000,
> and (b) allow those connections.
> 
> If I understand correctly:
> 
> 1. On Ubuntu box running X server:
>     xhost +
> That should allow all hosts to connect to X server
> 
> 2. On some other box:
> 
>     export DISPLAY=ubuntu_hostname;0.0
>     xterm
> 
> The xterm should show up on the Ubuntu boxes screen.
> 
> Firewalls or NAT can get in the way, too.
>