Can't open display: 192.168...

Question

Recently I stumbled across the problem with remote X display (without ssh).

I have two hosts

• 192.168.0.3 - which runs xclients

• 192.168.0.4 - which has xserver

My configuration of lightdm.conf

#
# General configuration
#
[LightDM]
[SeatDefaults]
xserver-allow-tcp=true
greeter-session=unity-greeter
greeter-hide-users=true
user-session=default
session-wrapper=/etc/X11/Xsession
autologin-user=debian
autologin-user-timeout=0

[XDMCPServer]
enabled=true

On 192.168.0.104 I've executed xhost +.

I've also checked with telnet if port 6000 is open for connection by executing telnet 192.168.0.104 6000

telnet successfully connected to remote computer.

But when I am trying to display something on remote X by command:

xeyes -display 192.168.0.104

I got: Error: Can't open display

both machines have Debian installed with lxde.

Any suggestions why it doesn't work?

Answer 1

You need to specify the display to connect to on the remote machine, e.g.:

xeyes -display 192.168.0.104:0

In general, a display name is:

hostname:displaynumber.screennumber

hostname can be omitted for local connections, and .screennumber can be omitted to use the default screen.