Got Connection lost AND then Not connected while i open new document

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1

I have deployed grist-core in Docker Swarm, my config:

version: “3.9”
services:
grist:
image: “gristlabs/grist”
ports:
- target: 8484
published: 8484
protocol: tcp
mode: host
volumes:
- grist_storage:/persist
environment:
APP_DOC_URL: https://grist.mysite.com
APP_HOME_URL: https://grist.mysite.com
deploy:
resources:
limits:
memory: 1G
cpus: ‘1’
replicas: 1

volumes:
grist_storage:
driver_opts:
type: “nfs”
o: “addr=172.17.0.100,rsize=8192,wsize=8192,timeo=14,intr,nolock,soft,retrans=5,rw”
device: “:/volume100/grist_storage”

I open my site, tap “Create new document” and then I got:

  1. Empty page (not like Excel table);
  2. Error in right corner: Connection lost → Attempting to reconnect …
  3. Then in 5-10 sec error: Not connected → The document is in read-only mode until you are back online … BUT I am online, and tried to do it several times.

Please, help me

2

Feels like a websocket issue, like in Document Page "Not Connected" · Issue #226 · gristlabs/grist-core · GitHub or websocket not working · Issue #150 · gristlabs/grist-core · GitHub - I’m not familiar with docker swarm configuration though.