Help needed on autokuma to uptime-kuma on remote server within my network

[yarafie]

Hello,

I'm facing a strange issue, most probably due to my setup and configuration.

I'm running Ubuntu 22.04.5 LTS on let's call it Server-A.
I have uptime-kuma and autokuma running in docker containers on Server-A.
I have put the lables in each docker compose for each container service in all the rest of my docker compose stack, and autokuma is happily registering with uptime-kuma they are monitered, all of them with no issue's.

On a second Ubuntu 24.04.2 LTS machine let's call it Server-B.
I have a seperate docker stack, which includes a second autokuma which I have set it up and connected it to the uptime-kuma running on Server-A. The containers in this stack on Server-B are mostly different from the stack running on Server-B apart from autokuma and another container lets call it Container-A, I have other containers Let's call them Cointainer-B,C,D.... The lables for autokuma (id part) are different from Server-A and Server-B same for Container-A since Server-A is running the same type of container. All containers are within the same docker network.

Now to the problem, autokuma on Server-A and Server-B are monitored ok. Cointainer-A is also being monitored, Container-B which exists on both servers (using different id lables) are being monitored.

Containers-C to D are running on Server-B (These do not have corresponding containers on Server-A) and have lables but uptime-kuma is reporting the below error on each of those:

2025-05-22T10:10:36+03:00 [SOCKET] INFO: New websocket connection, IP = 172.25.0.1
2025-05-22T10:10:36+03:00 [AUTH] INFO: WebSocket with no origin is allowed
2025-05-22T10:10:36+03:00 [AUTH] INFO: Login by token. IP=172.25.0.1
2025-05-22T10:10:36+03:00 [AUTH] INFO: Username from JWT: "REDACTED"
2025-05-22T10:10:36+03:00 [AUTH] INFO: Successfully logged in user kuma. IP=172.25.0.1
2025-05-22T10:10:37+03:00 [MONITOR] WARN: Monitor #163 'Container-C': Failing: Request failed with status code 404 | Interval: 60 seconds | Type: docker | Down Count: 0 | Resend Interval: 0

Anyone can help?