Airflow 3.0.0 Docker Compose UI endlessly refreshing on external IP:port, works on localhost:8080

I am setting up Apache Airflow 3.0.0 using the official Docker Compose file (https://airflow.apache.org/docs/apache-airflow/3.0.0/docker-compose.yaml) on a Linux server (Ubuntu 22.04).

I have successfully brought up all the containers, and they show as healthy (docker compose ps output is OK, and initial errors like permissions or missing secrets seem resolved).

Problem:

When I access the Airflow UI from my local machine using the server's public IP and the mapped port (http://22.193.38.155:8080/), First it asks me to login and the page loads briefly but then continuously refreshes. However, when I access the UI from the server itself using http://localhost:8080, it works perfectly and I can see the DAGs, log in, etc. Observed Behavior (from logs): Checking the logs for the airflow-apiserver container (docker compose logs airflow-apiserver), I see repetitive entries like the following when trying to access from the external IP:

airflow-apiserver-1 | INFO: 22.193.38.155:xxxxx - "GET /ui/config HTTP/1.1" 401 Unauthorized
airflow-apiserver-1 | INFO: 22.193.38.155:xxxxx - "GET /api/v2/auth/login?... HTTP/1.1" 307 Temporary Redirect
airflow-apiserver-1 | INFO: 22.193.38.155:xxxxx - "GET /auth/login/?next=... HTTP/1.1" 302 Found
... and so on, repeating ...

Configuration:

What could be causing the repeated 401 Unauthorized errors for API calls like /ui/config when accessing externally via http://22.193.38.155:8080/ and the resulting refreshing UI? Are there any other Airflow or Docker configurations necessary for external access in Airflow 3.0.0 that I might be missing?

Solution

The issue was indeed related to the apache-airflow-providers-fab package, as suggested by @bcincy's comment.

Solution

Edited my docker-compose.yaml file. Modified the _PIP_ADDITIONAL_REQUIREMENTS line within the environment: block to include the FAB provider version 2.0.2

x-airflow-common:
  &airflow-common
  # ... other common settings ...
  environment:
    &airflow-common-env
    # ... existing environment variables (including AIRFLOW__CORE__BASE_URL) ...

    # Modified this line to add the FAB provider package:
    _PIP_ADDITIONAL_REQUIREMENTS: ${_PIP_ADDITIONAL_REQUIREMENTS:-} apache-airflow-providers-fab==2.0.2

    # ... rest of environment variables ...

Saved the docker-compose.yaml.
Stopped the running containers and started them again to pick up the environment variable and install the package:

docker compose down
docker compose up -d