xvnc failed to start

[PeterTerpe]

Describe the bug

Process keeps restarting due to xvnc timeout:

sdvd-server       | [xvnc          ] Args:  "-nolisten" "tcp" "-nolisten" "local" "-listen" "unix" "-geometry" "1280x800" "-depth" "24" "-rfbport=5900" "-UseIPv6=yes" "-rfbunixpath=/tmp/vnc.sock" "-rfbunixmode=0660" "-SecurityTypes=None" "-desktop=Stardew Dedicated Server" ":0"
sdvd-server       | [xvnc          ] Xvnc TigerVNC 1.11.0 - built 2022-01-26 17:59
sdvd-server       | [xvnc          ] Copyright (C) 1999-2020 TigerVNC Team and many others (see README.rst)
sdvd-server       | [xvnc          ] See https://www.tigervnc.org for information on TigerVNC.
sdvd-server       | [xvnc          ] Underlying X server release 12011000, The X.Org Foundation
sdvd-server       | [xvnc          ] Sat Jan 31 02:41:40 2026
sdvd-server       | [xvnc          ]  vncext:      VNC extension running!
sdvd-server       | [xvnc          ]  vncext:      Listening for VNC connections on /tmp/vnc.sock (mode 0660)
sdvd-server       | [xvnc          ]  vncext:      created VNC server for screen 0
sdvd-server       | [supervisor    ] service 'xvnc' failed to be started: not ready after 10000 msec, giving up.
sdvd-server       | [supervisor    ] stopping service 'xvnc'...
sdvd-server       | [xvnc          ] Sat Jan 31 02:41:50 2026
sdvd-server       | [xvnc          ]  ComparingUpdateTracker: 0 pixels in / 0 pixels out
sdvd-server       | [xvnc          ]  ComparingUpdateTracker: (1:-nan ratio)
sdvd-server       | [supervisor    ] service 'xvnc' exited (with status 0).
sdvd-server       | [supervisor    ] stopping service 'dbus'...
sdvd-server       | [supervisor    ] service 'dbus' exited (with status 0).
sdvd-server       | [finish      ] executing container finish scripts...
sdvd-server       | [finish      ] all container finish scripts executed.
sdvd-server exited with code 1 (restarting)

Steps to reproduce

1. Download docker-compose.yml and .env from github
2. In docker-compose.yml, change the tag of images in docker-compose.yml to preview due to the lack of latest tag
3. In docker-compose.yml, change the network from sdvd-net to host. Because my server is in China, I need to use proxy to connect with steam, and on my setup the proxy cannot proxy bridge network.
4. Start the server with docker compose up -d

Expected behavior

Start without xvnc timeout.

Additional context

No response

Final checks

• Read the contribution guide.
• Check existing issues.

[PeterTerpe]

System info:

OS: Debian GNU/Linux 12 (bookworm) x86_64 
Kernel: 6.1.0-41-amd64 
CPU: 12th Gen Intel i5-12600KF (16) @ 4.900GHz 
GPU: AMD ATI Radeon HD 5000/6000/7350/8350 Series 
Memory: 41202MiB / 80216MiB

[Bombombur]

3. sdvd-net

Try the last build, so depends on your system do a full clone or get the docker and env file (+ tools folder).

Change the Version only in the .env file at the top: "# Version
"# Use "latest" for stable releases, "preview" for latest preview builds"
"# Or pin to a specific version like "1.0.0" or "1.1.0-preview.3""
"# See available tags at: https://hub.docker.com/r/sdvd/server/tags"
"# IMAGE_VERSION=latest""

And if you need to pass it as host:
Add in the docker after :

server:
image: sdvd/server:${IMAGE_VERSION:-latest}
container_name: sdvd-server
stdin_open: true
tty: true
ports:
- "${VNC_PORT:-5800}:5800"
- "${API_PORT:-8080}:8080"
- "${GAME_PORT:-24642}:24642/udp"
network_mode: "host"

Host mode is normally not define under the network as you want to do a pass-thru.

[JulianVallee]

Hm, not really sure what's broken yet, and port 5800 is probably not just already used, right?

Can you try setting DISPLAY=123 env var in your docker-compose.yml, then restart the server and see if that makes a difference? Probably not, but theres a slim chance that xvnc in network_mode host, in a debian container running on a debian host, might do weird things :D

I'll definitely have to check how to add better logging for this, it's mostly coming OOTB with our base image

edit: Not sure if it's even related, but just saw this for the first time randomly during tests, dropping it here in case it is: