No connection to Chrome, no screenshots or archives get created

[eiacub]

Describe the Bug

for some time, the instance stopped creating screenshots and archives of links saved.

Steps to Reproduce

`services:
web:
image: ghcr.io/karakeep-app/karakeep:${KARAKEEP_VERSION:-release}
restart: unless-stopped
volumes:
# By default, the data is stored in a docker volume called "data".
# If you want to mount a custom directory, change the volume mapping to:
# - /path/to/your/directory:/data
- /path/to/karakeep-app/data:/data
ports:
- 3800:3000
env_file:
- .env
environment:
MEILI_ADDR: http://meilisearch:7700
BROWSER_WEB_URL: http://chrome:9222
# OPENAI_API_KEY: ...

  # You almost never want to change the value of the DATA_DIR variable.
  # If you want to mount a custom directory, change the volume mapping above instead.
  DATA_DIR: /data # DON'T CHANGE THIS

chrome:
image: gcr.io/zenika-hub/alpine-chrome:124
restart: unless-stopped
command:
- --no-sandbox
- --disable-gpu
- --disable-dev-shm-usage
- --remote-debugging-address=0.0.0.0
- --remote-debugging-port=9222
- --hide-scrollbars
meilisearch:
image: getmeili/meilisearch:v1.13.3
restart: unless-stopped
env_file:
- .env
environment:
MEILI_NO_ANALYTICS: "true"
volumes:
- /path/to/karakeep-app/meilisearch:/meili_data
networks: {}
`

##########################

`KARAKEEP_VERSION=release
NEXTAUTH_SECRET=xUcL................................I6qSg
MEILI_MASTER_KEY=/DZNE.....................................MFAr

NEXTAUTH_URL=https://example.com

OPENAI_API_KEY=....................................

INFERENCE_ENABLE_AUTO_TAGGING=true
INFERENCE_ENABLE_AUTO_SUMMARIZATION=true

DISABLE_SIGNUPS=true

CRAWLER_FULL_PAGE_SCREENSHOT=true
CRAWLER_FULL_PAGE_ARCHIVE=true
CRAWLER_VIDEO_DOWNLOAD=true
CRAWLER_SCREENSHOT_TIMEOUT_SEC=30
OCR_LANGS=en,de,hu

EMAIL_VERIFICATION_REQUIRED=true

SMTP_HOST=host.com
SMTP_PORT=587
SMTP_SECURE=false
SMTP_USER=noreply@host.com
SMTP_PASSWORD=...................
SMTP_FROM=noreply@host.com
`

Expected Behaviour

it worked perfectly and unfortunately, I have not noticed when it stopped

Screenshots or Additional Context

`2026-03-02T19:56:25.813Z error: [Crawler] Failed to connect to the browser instance, will retry in 5 secs: browserType.connectOverCDP: Unexpected status 500 when connecting to http://chrome:9222/json/version/.
This does not look like a DevTools server, try connecting via ws://.
Call log:

• retrieving websocket url from http://chrome:9222/

  at Proxy.connectOverCDP (/app/apps/workers/node_modules/.pnpm/playwright-extra@4.3.6_playwright-core@1.58.2_playwright@1.58.2/node_modules/playwright-extra/dist/index.cjs.js:772:63)
  at async startBrowserInstance (/app/apps/workers/dist/index.js:63634:10)
  at async tryCatch (/app/apps/workers/dist/tryCatch-2ZMSfte2.js:4:16)
  at async file:///app/apps/workers/dist/index.js:63646:31
  2026-03-02T19:56:25.813Z info: [Crawler] Not defined in the server configuration BROWSER_COOKIE_PATH
  2026-03-02T19:56:25.813Z info: Starting crawler worker ...
  2026-03-02T19:56:25.813Z info: Starting crawler worker ...
  2026-03-02T19:56:25.814Z info: [import] Starting import polling worker
  2026-03-02T19:56:30.813Z info: [Crawler] Connecting to existing browser instance: http://chrome:9222
  2026-03-02T19:56:30.814Z info: [Crawler] Successfully resolved IP address, new address: http://chrome:9222/
  2026-03-02T19:56:31.119Z error: [Crawler] Failed to connect to the browser instance, will retry in 5 secs: browserType.connectOverCDP: Unexpected status 500 when connecting to http://chrome:9222/json/version/.
  This does not look like a DevTools server, try connecting via ws://.
  Call log:

• retrieving websocket url from http://chrome:9222/

  at Proxy.connectOverCDP (/app/apps/workers/node_modules/.pnpm/playwright-extra@4.3.6_playwright-core@1.58.2_playwright@1.58.2/node_modules/playwright-extra/dist/index.cjs.js:772:63)
  at async startBrowserInstance (/app/apps/workers/dist/index.js:63634:10)
  at async tryCatch (/app/apps/workers/dist/tryCatch-2ZMSfte2.js:4:16)
  at async file:///app/apps/workers/dist/index.js:63646:31
  `
  #################################################

`DevTools listening on ws://0.0.0.0:9222/devtools/browser/d0da1cf4-4ffb-44d1-a388-8d00189ecabd
[0302/193053.936117:WARNING:bluez_dbus_manager.cc(248)] Floss manager not present, cannot set Floss enable/disable.
root@green[/home/truenas_admin]# docker logs -f karakeep-app-chrome-1
[0302/194846.880533:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
[0302/194846.881506:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
[0302/194846.881548:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
[0302/194846.928599:WARNING:sandbox_linux.cc(420)] InitializeSandbox() called with multiple threads in process gpu-process.
[0302/194847.077219:INFO:config_dir_policy_loader.cc(118)] Skipping mandatory platform policies because no policy file was found at: /etc/chromium/policies/managed
[0302/194847.077958:INFO:config_dir_policy_loader.cc(118)] Skipping recommended platform policies because no policy file was found at: /etc/chromium/policies/recommended

DevTools listening on ws://0.0.0.0:9222/devtools/browser/06d3d29d-e317-49c8-95ff-dee7a44b6b2e
[0302/194847.086591:WARNING:bluez_dbus_manager.cc(248)] Floss manager not present, cannot set Floss enable/disable.
[0302/194936.652603:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
[0302/194936.702225:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
[0302/194936.702287:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
[0302/194936.849400:INFO:config_dir_policy_loader.cc(118)] Skipping mandatory platform policies because no policy file was found at: /etc/chromium/policies/managed
[0302/194936.849423:INFO:config_dir_policy_loader.cc(118)] Skipping recommended platform policies because no policy file was found at: /etc/chromium/policies/recommended
[0302/194936.887242:WARNING:bluez_dbus_manager.cc(248)] Floss manager not present, cannot set Floss enable/disable.
`

Device Details

Debian GNU/Linux 12 (bookworm)

Exact Karakeep Version

0.31.0

Environment Details

28.3.1, build 38b7060

Debug Logs

No response

Have you checked the troubleshooting guide?

• I have checked the troubleshooting guide and I haven't found a solution to my problem

[Vatson112]

Same problem.

Seemed that Crawler canot resolve IP addr

2026-03-14T19:14:04.161Z info: [Crawler] Connecting to existing browser instance: http://chrome:9222/
2026-03-14T19:14:04.162Z info: [Crawler] Successfully resolved IP address, new address: http://chrome:9222/
2026-03-14T19:14:04.466Z error: [Crawler] Failed to connect to the browser instance, will retry in 5 secs: browserType.connectOverCDP: Unexpected status 500 when connecting to http://chrome:9222/json/version/.
This does not look like a DevTools server, try connecting via ws://.
Call log:
  - <ws preparing> retrieving websocket url from http://chrome:9222/

    at Proxy.connectOverCDP (/app/apps/workers/node_modules/.pnpm/playwright-extra@4.3.6_patch_hash=7nc6rwxl5vjub4hxnqupqavqpi_playwright-core@1.58.2_playwright@1.58.2/node_modules/playwright-extra/dist/index.cjs.js:772:63)
    at async startBrowserInstance (/app/apps/workers/dist/index.js:63664:10)
    at async tryCatch (/app/apps/workers/dist/tryCatch-2ZMSfte2.js:4:16)
    at async file:///app/apps/workers/dist/index.js:63673:31

On wokring instance, it looks like:

2026-03-14T19:00:53.154Z info: [Crawler] Connecting to existing browser instance: http://chrome:9222
2026-03-14T19:00:57.006Z info: [Crawler] Successfully resolved IP address, new address: http://172.18.0.4:9222/

Also i dont unrestand how it happens. Both instances use same docker images

CONTAINER                REPOSITORY                        TAG                 PLATFORM            IMAGE ID            SIZE                CREATED
karakeep-chrome-1        gcr.io/zenika-hub/alpine-chrome   124                 linux/amd64         4d356fd088b4        674MB               16 months ago
karakeep-meilisearch-1   getmeili/meilisearch              v1.13.3             linux/amd64         35435ac70782        143MB               12 months ago
karakeep-web-1           ghcr.io/karakeep-app/karakeep     0.31.0              linux/amd64         e0bb62aa5300        1.23GB              2 weeks ago

Same docker compose, but NON working instance has traefik as reverse proxy. So it looks like this:

x-baseconfig: &baseconfig
  logging:
    driver: json-file
    options:
      max-size: "10m"
      max-file: 3
  restart: unless-stopped

networks:
  traefik:
    external: true
  int:

services:
  web:
    <<: *baseconfig
    image: ghcr.io/karakeep-app/karakeep:${KARAKEEP_VERSION}
    volumes:
      - ./krp:/data
    env_file:
      - .env
    environment:
      MEILI_ADDR: http://meilisearch:7700
      BROWSER_WEB_URL: http://chrome:9222

      # OPENAI_API_KEY: ...

      # You almost never want to change the value of the DATA_DIR variable.
      # If you want to mount a custom directory, change the volume mapping above instead.
      DATA_DIR: /data # DON'T CHANGE THIS
    networks:
      - int
      - traefik
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.krp.rule=Host(`krp.home`)"
      - "traefik.http.routers.krp.entrypoints=websecure"
      - traefik.http.services.krp.loadbalancer.server.port=3000
      - traefik.http.routers.krp.tls=true
      - traefik.http.routers.krp.tls.certresolver=home
      - traefik.docker.network=traefik


  chrome:
    <<: *baseconfig
    image: gcr.io/zenika-hub/alpine-chrome:124
    command:
      - --no-sandbox
      - --disable-gpu
      - --disable-dev-shm-usage
      - --remote-debugging-address=0.0.0.0
      - --remote-debugging-port=9222
      - --hide-scrollbars
    networks:
      - int


  meilisearch:
    <<: *baseconfig
    image: getmeili/meilisearch:v1.13.3
    env_file:
      - .env
    environment:
      MEILI_NO_ANALYTICS: "true"
    volumes:
      - ./meilisearch:/meili_data
    networks:
      - int

Note that remove traefik from network and use only one int, like in docs, also not work with the same error.

[Vatson112]

I found what cause problem.

Crawler fails to connect to Chrome on Docker hosts with IPv6 enabled

Root Cause

# Broken host — resolves to IPv6
$ docker exec karakeep-web-1 getent hosts chrome
fdd0:0:0:8::2   chrome

# Working host — resolves to IPv4
$ docker exec karakeep-web-1 getent hosts chrome
172.18.0.4      chrome

Seems that karakeep resolver only handles IPv4 addresses.

Workaround

Explicitly disable IPv6 on the internal Docker network in docker-compose.yml:

networks:
  int:
    enable_ipv6: false

Then recreate network and full stack:

docker compose down && docker compose up -d