Frequently Asked Questions For Cotton Pajamas for Kids
It means the proxy or load balancer reached the backend address, but the backend rejected the TCP connection or wasn't listening on the expected host and port. The connection reached its destination, but nothing accepted it there.
The usual culprits are a backend application that isn't running or failed to start, a mismatched port between the proxy and backend, or a service bound to localhost (127.0.0.1) instead of 0.0.0.0. Firewall, SELinux, or network policy rules blocking the connection are also frequent causes.
First verify the backend process is running and check its logs for startup errors, then confirm it's listening on the expected port using a tool like `ss` or `netstat`. Testing the backend directly with `curl` or `telnet` helps isolate whether the problem is the backend or the proxy.
In containerized environments the proxy often points at the wrong service name, hostname, or DNS target, or uses `localhost` instead of the actual backend service name. Make sure the proxy and backend share the same network and that you reference the service by its correct name.
A connection refused means the host was reachable but actively rejected the connection, usually because nothing was listening on that port. A timeout typically means the host or port was unreachable altogether, often due to firewalls, routing issues, or a hung backend.
Review your `proxy_pass` and upstream settings to confirm they point to the correct host and port, then verify the backend is up and listening on the right interface. Restarting the backend and reloading Nginx after correcting the config usually resolves it.
When a service binds only to 127.0.0.1, it accepts connections from its own host but rejects requests from other containers or machines. Binding to 0.0.0.0 or the correct network interface lets the proxy on another host reach it.
Firewall rules, SELinux settings, or Kubernetes network policies can block traffic between the proxy and backend, producing a refused connection even when the backend is healthy. Check that traffic on the relevant port is explicitly allowed.
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