# WHATPORT(6543)

## NAME

port 6543 — Pyramid development server (IANA: lds-distrib) — The Pyramid/Waitress development server's default port, registered to IANA as lds_distrib.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registers 6543 as lds-distrib, assigned to Jack Baker, but the occupant you will actually meet is a Python web app: a Pyramid project created from the standard cookiecutter ships development.ini with `listen = localhost:6543`, so `pserve development.ini` serves on 6543 through Waitress. That configuration also enables the pyramid_debugtoolbar, which exposes tracebacks and, historically, an interactive debugger console. Seeing it open means a developer's machine or a container that shipped its dev config into an environment it should not have.

## EXPOSURE

**Do not expose.** A development server with the debug toolbar enabled leaks source, settings, and stack frames; the default config binds localhost for exactly this reason. Production uses a real WSGI deployment behind a reverse proxy, not 6543.

## CHECK

```sh
curl -sI http://TARGET:6543/
```

## SEE ALSO

- docs — [Pyramid — Creating a Pyramid Project (development.ini, port 6543)](https://docs.pylonsproject.org/projects/pyramid/en/latest/narr/project.html) (docs.pylonsproject.org)
- source — [Pylons/pyramid on GitHub](https://github.com/Pylons/pyramid) (github.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6543 (lds-distrib)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6543) (iana.org)

---

HTML: <https://whatport.net/6543/> · JSON: <https://whatport.net/6543.json> · full dataset: <https://whatport.net/ports.json>