"Invalid origin" trying to access Joplin Server

Support
1

Operating system

Linux

Joplin version

3.7.1

Sync target

Joplin Server

What issue do you have?

Hello everyone

I'm trying to setup Joplin on my VPS and using Traefik v3 as reverse proxy.
the setup looks ok but accessing every url of the server returns Invalid origin 404

my config dead simple:
.env

APP_BASE_URL=jop.***.com

traefik config

[http.routers.joplin]
entryPoints = ["websecure"]
rule= "Host(`jop.***.com`)"
service = "joplin"
[http.routers.joplin.tls]
certResolver="mainc"
[[http.services.joplin.loadBalancer.servers]]
url = "http://joplin:22300"

and I'm running jopling with command equivalent to: podman run -p 22300:22300 --env-file .env joplin/server:latest

and Joplin log when trying to access the service is

10:39:48 1|app  | 2026-08-21 10:39:48: App: 89.199.229.190: Invalid origin: http://jop.***.com: GET /joplin (404) (0ms)
10:39:49 1|app  | 2026-08-21 10:39:49: App: 89.199.229.190: Invalid origin: http://jop.***.com: GET /favicon.ico (404) (0ms)

P.S. *** is replacement for my tld