Immediate Crash: X Connection to :0 broken

[voidfactory 0]

Hi,

after being able to install eddie-ui-git again on my CachyOS system, with Niri and DMS, the program starts, asks me for system permission and then initializes, only to immediately crash once it has finished initializing. Interestingly, it also immediately crashes Discord when it happens to be open. his is the entire process of what happens when I type eddie-ui into the terminal: 

❯ eddie-ui
Could not set X locale modifiers
Gtk not found (missing LD_LIBRARY_PATH to libgtk-x11-2.0.so.0?), using built-in colorscheme
. 2026-10-31 17:05:46.452 - Eddie version: 2.27.2 / linux_x64, System: Linux, Name: CachyOS Linux, Version: Linux XXXX 7.3.0-4-cachyos #1 SMP PREEMPT_DYNAMIC Fri, 23 Oct 2026 15:59:50 +0000 x86_64 GNU/Linux, Framework: 6.8.0.96 (tarball Wed Jan 15 10:20:48 UTC 2020); Framework: v4.0.30319
. 2026-10-31 17:05:46.468 - Command line arguments (1): path.resources="/usr/share/eddie-ui"
. 2026-10-31 17:05:46.709 - Raise system privileges
. 2026-10-31 17:05:46.710 - Elevated launch with method 'pkexec': /usr/lib/eddie-ui/eddie-cli-elevated
. 2026-10-31 17:05:49.893 - Privileged tools run from: install directory (secure, no staging)
. 2026-10-31 17:05:49.893 - Runtime directory: /var/lib/eddie-vpn/run/spot
. 2026-10-31 17:05:50.108 - Collect network information
. 2026-10-31 17:05:50.382 - Reading options from /home/XXXX/.config/eddie/default.profile
. 2026-10-31 17:05:50.789 - WireGuard - Version: 1.0.0
. 2026-10-31 17:05:50.789 - OpenVPN - Version: 2.7.8 - OpenSSL 3.6.5 29 Sep 2026, LZO 2.10 (/usr/bin/openvpn)
. 2026-10-31 17:05:50.789 - SSH - Version: OpenSSH_10.6p1, OpenSSL 3.6.5 29 Sep 2026 (/usr/bin/ssh)
I 2026-10-31 17:05:50.789 - SSL - Not available
. 2026-10-31 17:05:50.935 - systemd-resolved restarted via systemctl

(eddie-tray:33496): libayatana-appindicator-WARNING **: 17:05:51.241: libayatana-appindicator is deprecated. Please use libayatana-appindicator-glib in newly written code.
I 2026-10-31 17:05:52.024 - Ready
. 2026-10-31 17:05:52.528 - Collect information about AirVPN completed
X connection to :0 broken (explicit kill or server shutdown).


I see that this is a display issue of some kind, but I'd appreciate any kind of guidance on how to diagnose and deal with the problem further. To note: I have previously tried installing eddie-ui, eddie-cli, eddie-ui as an appimage as well as through the git clone process. This is the eddie-ui-git version. Are there any remnants from those installations trying to interfere?


Best
 

[voidfactory 0]

After more tinkering, I deleted the folder for eddie at default.profile and was able to start the app without crashing. It will even let me log-in and connect to a server using the Connect to a recommended server option on the start screen. However, it will immediately crash when I press Activate Network Lock, and the program will also immediately crash once I restart it. I need to delete the .config folder again for it to reset and then it does open and I can log-in and connect. What is happening here? Is this a permissions issue?

The terminal at the moment of crash outputs this:

    Native Crash Reporting
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
/usr/bin/eddie-ui: line 3: 82413 Aborted                    (core dumped) ./eddie-ui --path.resources=/usr/share/eddie-ui "$@"

Edited ... by voidfactory

[Staff 10691]

Hello!

Discord crashing at the same moment is the key detail: the X server itself is going away, not only Eddie. Eddie's UI is an X11 (Mono WinForms) application, so on Niri it runs through xwayland-satellite, like Discord. "X connection to :0 broken (explicit kill or server shutdown)" is what every X11 client prints when that server disappears, and the Mono SIGSEGV in your second message is most likely Eddie dying after it lost its display. It is not a permissions issue: elevation through pkexec worked and the privileged part started correctly.

The trigger is consistent: activating Network Lock. Eddie keeps the Network Lock state in its profile folder and applies it again at the next start, so the same step runs at every launch until you delete ~/.config/eddie. You don't need to delete it: just make sure Network Lock is off before closing Eddie, and the next start will be clean.

Important: if Eddie crashes while Network Lock is active, the firewall rules stay in place by design (that's what prevents leaks), so you may have no connectivity afterwards. Start Eddie again and deactivate Network Lock, or check the rules with:
 

sudo nft list ruleset

To see which process actually crashes, please run this right after a crash and post the output:

coredumpctl list --since "10 min ago"
journalctl --user -b --since "10 min ago" | grep -i -E "xwayland|satellite"

If xwayland-satellite shows up there, the problem is on the compositor side. Niri users have reported random crashes with exactly this message, fixed by updating xwayland-satellite (the -git version) or, in some cases, by going back to an older Mesa release:
https://github.com/niri-wm/niri/issues/3199 
Please also tell us your xwayland-satellite and Mesa versions. If you can, a quick test in a session with standard Xwayland (Plasma or GNOME) would confirm it: if Network Lock works there, Eddie's firewall part is fine.

About leftovers: the different Eddie builds share only the profile folder ~/.config/eddie, and the AppImage is self-contained. Just check that a single Eddie package is installed:

pacman -Qs eddie

In the meantime, two options that do not need X at all, both with Network Lock:
- Eddie CLI edition (eddie-cli)
- AirVPN Suite (Bluetit daemon and Goldcrest client): https://airvpn.org/linux/suite/

Kind regards