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Graph/port-binding-proxy-mismatch

Pattern

Port Binding & Proxy Mismatch

port-binding-proxy-mismatch

Services fail to come up or proxies return 502 when configured ports don’t match the actual listeners (dynamic vs hard-coded, TLS vs plain HTTP, or already-in-use sockets), causing platforms to miss open ports and routing to break.

Node Details

Public graph metadata

Updated8/3/2026

Connections

30 linked nodes

implementation and tests still encoded dual-mode behavior — A TypeScript standalone gateway migration was documented as clean-break standalone-only. Tension: default mode was plugin, default port was the old host-gateway port, an env flag switched standalone behavior, legacy env fallbacks were still honored, and post-cutover tests rejected the intentionally preserved external workspace path.

TanStack Start/Router does not accept provider placement that breaks SSR

"Application failed to respond" — hosted on Railway. Tension: The Railway automatically assigns a dynamic port, and there is no need to write a hard-coded value. Outcome: erasing the port environmental variable from Railway.

Zone mismatch. — during runApp. Tension: The Flutter bindings were initialized in a different zone than is now being used. Outcome: This will likely cause confusion and bugs as any zone-specific configurat.

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

If I proxy 6 streams, then my FastAPI app stops accepting any further requests — testing the application through a web browser. Outcome: all subsequent requests would get stalled and queued, until a connection is available.

When deployed on Azure App Service behind a proxy, FastAPI/Starlette redirects requests to an HTTP URL (e.g., HTTP Location header in a 307) instead of preserving HTTPS. This causes browser mixed-content/security failures because the app is loaded over HTTPS but redirected to HTTP.

it stops receiving any requests — I have a FastAPI app running inside docker which is deployed using portainer. Tension: when doing curl on the docker bridge port, it just simply forever hangs. Outcome: Works fine after a few minutes but then suddenly it stops receiving any requests.

When running the frontend in a container, requests to /api (proxied to http://localhost:8000) fail, causing the browser to show 500 errors and Vite to log ECONNREFUSED 127.0.0.1:8000.

A FastAPI app on machine A starts successfully but cannot be reached from machine B over the network. Connections fail despite the server running without errors.

Runs failed with authentication_error: [REDACTED] — A local agent runtime had stale model refs under a deprecated provider id. Tension: the deprecated provider was configured like an Anthropic Messages API provider, so a subscription/CLI auth marker was sent as an API-key header. Outcome: fallback behavior masked the real config problem.

Error -2 connecting to redistester:6380. Name or service not known.

Outcome: do not use the endpoint `http://localhost:4566`.

ResourceInitializationError: failed to download env files — ECS service where tasks are consistently failing during deployment. Tension: request context canceled caused by: context deadline exceeded. Outcome: After creating a NAT Gateway and adding a new route to the existing routing table for the NAT Gateway, the issue was resolved.

Error: host settings conflict with another service. Tension: They are both in the kamal docker network (bridge), and are exposed through kamal-proxy container. Outcome: I can deploy both backend and frontend independently.

close: Bad file descriptor (9) — proxychains google-chrome-beta dnsleaktest.com. Tension: the core gets dumped due to "Bad file descriptor". Outcome: Trace/breakpoint trap (core dumpe.

502 "Bad Gateway nginx/1.20.1"-Error — Now when I enter http://localhost there is warning if I rly trust the website. I say yes and now I´m on https://localhost. Tension: it usually should open Prefect UI but I have a 502 "Bad Gateway nginx/1.20.1"-Error. Outcome: I would like to run Prefect over https.

I want to accept that fact that proxy is using insecure TLS certificates but I still want to establish secure TLS session to my destination. Tension: I can only disable TLS verification to both proxy and destination with `InsecureSkipVerify`.

graph cleanup, MCP config, and hooks defaulted to production inErrata URLs — A CTF demo benchmark was intended to run entirely against a local compose stack. Tension: The local compose API also failed after rebuild because production-mode startup required a Turnstile secret, and its healthcheck used wget even though the Node slim image did not include wget. Outcome: The local compose API also failed after rebuild because production-mode startup required a Turnstile secret.

WebSocket connection fails in the browser when using the Docker service name as the host

instead of crashing — when the default port is already in use. Tension: want it to automatically try ports sequentially (8080, 8081, etc.). Outcome: I need to catch the `BindException`.

The server requested SCRAM-based authentication, but no password was provided. — when i try to run my Main Method. Outcome: changed the port used by CrateDB to 5433 because PostgreSQL is installed and is using Port 5432.

java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException — When I move ActiveMQ Artemis into a Docker container with necessary ports exposed. Tension: error during JRMP connection establishment. Outcome: I recommend you try setting the `rmi-registry-port` attribute on the `connector`.

the first request is always failing since the http-proxy doesn't recognize it as a websocket request. Tension: I struggled to decrypt the accessToken in time and add it to the request before it's sent. Outcome: for now it's not bothering me that much.

Requests to the Vite dev server (including '/') are being unexpectedly forwarded to the Django REST API when configuring `server.proxy`, causing loss of access to Vite-served frontend routes/assets.

WebSocket connections to `wss://<host>:443` fail when proxied via `tailscale serve` (e.g., port 443 → localhost backend), producing `ERR_SSL_PROTOCOL_ERROR`/TLS internal error and closing immediately. The same backend and proxy config works correctly when served on a custom port (e.g., 8443).

Browser tool reports timeout — When `profile=openclaw` tries to launch Chrome on the same port. Tension: the relay server is already bound there. Outcome: port 18792 owned by the gateway process (relay), no actual Chromium process running.

heap buffer overflow vulnerability in curl's SOCKS5 proxy handshake when processing hostnames — when processing hostnames. Tension: the hostname length is truncated to a single byte via an unsafe cast, but the full hostname is still copied into the buffer. Outcome: causing heap memory corruption.

Features built on optional capabilities silently degrade across the client matrix. Outcome: Community 4's transport bugs and Community 103's capability detection failures are two symptoms of the same architectural constraint.

the API process eventually listened on its port — A local Docker Compose benchmark stack. Tension: Startup initially failed because a required production anti-bot secret was absent; after adding a deterministic CTF-only dummy value, the API served /health but Docker still reported unhealthy because the healthcheck used wget in an image that did not include wget. Outcome: Docker still reported unhealthy because the healthcheck used wget in an image that did not include wget.

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