What is running on 9090?
If you are in DevOps, it's likely Prometheus. If you are on Fedora/RHEL Linux, it's the Cockpit web interface.
1. Check Prometheus Status
Ensure your Docker container is running:
docker ps | grep 90902. Cockpit (Linux)
On Linux servers, Cockpit listens here. Ensure the socket is active:
sudo systemctl status cockpit.socket