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Graph/wrong-port-protocol-proxy-reachability

Pattern

Misaligned Networking & Ports

wrong-port-protocol-proxy-reachability

Reverse-proxy and service deployments fail intermittently because client requests target the wrong network/port/protocol—e.g., 502 when a dependent service isn’t reachable, ports already in use, or dynamic port/proxy configuration being ignored.

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Public graph metadata

Updated7/7/2026

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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.

Tension: the backend doesn’t seem to be serving requests, and the frontend likely fails due to a dependent API call. Outcome: The deployment succeeds (`READY` state).

Deploying a monorepo with a React client and Node/Express server on Vercel using a shared origin fails: the server cannot reliably serve client static files from client/dist, leading to missing/dist errors or 404s for built assets and routing.

"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.

Deploying to Vercel fails to apply the desired npm install flags (e.g., `--legacy-peer-deps`), causing dependency/peer conflicts during deployment.

errors with 502 and 504 HTTP codes are ignored by Sentry — I'm using Sentry to catch errors in my React app. Tension: some React errors are ignored too. Outcome: I'd like to override this behavior.

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.

axios made the requests to `http://sub.domain.tld/api/path`, while my reverse proxy forwarded that to the IP:Port

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.

Getting 502 bad gateway after deploying dockerize app into google app engine.

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.

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.

the process appears to "hang" at startup — Running the inErrata API locally / on a dogfood box. Tension: The port never opens; health checks get connection-refused. Outcome: the actual app process has already exited.

The Heroku-hosted MERN app receives many automated-looking requests from the same forwarded IP in the same second, with suspicious query/path content (e.g., unexpected “if”/“php” strings). This behavior appears to be scanning or an attack proxy and raises concerns about security and abuse.

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

we are seeing 500 errors when hitting some backend endpoints — we have a react-based (version 16.14.0) PWA that is hosted on Microsoft Azure app service plans (premium tier). Tension: It is ONLY affects POST endpoints. GET endpoints successfully continue to work to these backends. Outcome: Current workaround is to change your app service to use http 1.1.

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 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.

I see multiple redirects in the network tab. I have this error: ERR_TOO_MANY_REDIRECTS — I'm working on a REST API using Java 21 with Spring Boot 3.3, and I'm trying to implement authentication through an external site using OpenID.

upstream prematurely closed connection while reading response header from upstream — When a user in my Django application installed on Ubuntu from DigitalOcean (v18+) selects multiple files to send on server. Tension: 502 Bad Gateway. Outcome: Changing the droplet size on DigitalOcean solved my problem.

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).

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.

429s from OpenAI (RPM limit exceeded) — We have ~200 autonomous agents hitting our internal API gateway. Tension: Cascading retries amplifying the load. Outcome: P99 latency spikes to 30+ seconds.

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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