set-up X11 Forwarding over ssh

Question

I\'m attempting to set up x11 forwarding to monitor video on an embedded robotics platform yet I cannot seem to get the board to generate graphical output. I\'m running Arc

Answer 1

Whenever I had this problem it was almost always about following two options, I think you should set them as below before making any further changes on your configuration like setting DISPLAY, etc.

X11Forwarding yes
X11UseLocalhost no

Answer 2

On the server

Edit /etc/ssh/sshd_config:

AllowAgentForwarding yes
AllowTcpForwarding yes
X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost no

Restart the sshd daemon:

sudo service sshd restart
# or
sudo /etc/init.d/ssh restart
# or whatever way of restarting your box services works on your distro...

yum -y update xauth
apt-get -y update xauth
yum -y install xauth
apt-get -y install xauth

Now exit the server:

exit

On the client

Set the DISPLAY environment variable locally:

export DISPLAY=:0.0

and start a trusted SSH connection to the server:

ssh -Y $ssh_user@$ssh_server

Verify success with a graphical app. Install an app supporting X11 forwarding, if needed. As an example:

yum -y install xclock

and action:

for i in {1..3} ; do bash -c "xclock &" ; done ;

Answer 3

ssh should set the DISPLAY automatically. usual suspects: missing "X11Forwarding yes" in /etc/ssh/sshd_config

To debug you can run verbose mode on the client and server and you may notice something : try on the "server" side (debug mode, no daemon)

$ /usr/sbin/sshd -d -p 222

on the "client":

$ ssh -v -Y phil@192.168.0.14 -p 222

Once in a while I meet an odd thing, like 'missing xauth' ...