Tech Tip: Setting up remote X11 over TCP to Xephyr

**Warning!** The instructions given here may decrease your systems' security and may make it more vulnerable. Use at your own risk.

I recently wanted to set up a remote [X.org / X11](https://en.wikipedia.org/wiki/X.Org_Server) connection to a Xephyr server, which is an X server that runs inside a window. I only found partial information in web searches, so I wanted to provide a top-to-bottom guide for accomplishing this task.

The [Xephyr man page](https://linux.die.net/man/1/xephyr) omits the info in [Xnest's man page](https://linux.die.net/man/1/xnest) and that in [the "Xserver" man page](https://linux.die.net/man/1/xserver). Xephyr supports most of the flags in all of them.

To facilitate customisation, we will declare and use the following shell constants:

xephyr_port="1"
remote_xephyr_ip_host="192.168.1.100"

You may need to stop the firewalls on both client and server using something like:

sudo systemctl stop firewalld.service

Or the [stop-iptables noscript](https://github.com/shlomif/shlomif-computer-settings/blob/e9de56aa212706f5c1fc3906c2f0b92065851965/shlomif-settings/home-bin-executables/bin/stop-iptables).

Now start Xephyr on the local desktop:

Xephyr -listen tcp -listen unix -listen local -screen 1024x768 :"$xephyr_port"

Then connect to it and use `xhost`:

# On the X server
export DISPLAY=":$xephyr_port"
xterm &
xhost +

Now you should be able to connect to the Xephyr X server from the remote box:

# On the remote machine
export DISPLAY="$remote_xephyr_ip_host":"$xephyr_port"
xterm &
# Or a different window manager.
starticewm

## Licence

Copyright by Shlomi Fish, 2020.

You can reuse this entry under [the Creative Commons Attribution 4.0 Unported](https://creativecommons.org/licenses/by/4.0/) licence, or at your option any later version of it. See the [instructions](http://www.shlomifish.org/meta/copyrights/#cc_by_intr) on how to comply with it.

Whatever code given here is provided under the [MIT / Expat licence](https://tldrlegal.com/license/mit-license).

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