# WHATPORT(4567)

## NAME

port 4567 — Sinatra dev server / Galera replication (IANA: tram) — Two very different things: a Ruby Sinatra app in development, or a Galera cluster's replication channel.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA's name for 4567 is TRAM, which you will not meet. In practice it is one of two things. Ruby's Sinatra framework starts its built-in server on 4567, so a plain HTTP response here is usually someone's development app. Alternatively, MariaDB Galera and Percona XtraDB Cluster use 4567 for gcomm group communication — the replication channel between cluster nodes — with 4568 for incremental state transfer and 4444 for full snapshot transfer. An HTTP request distinguishes them in one shot.

## EXPOSURE

**Do not expose.** A Sinatra dev server runs with development error pages and no hardening; Galera group communication is unencrypted database replication unless TLS is explicitly configured. Neither belongs on a public interface.

## CHECK

```sh
curl -sI --max-time 5 http://TARGET:4567/
```

## SEE ALSO

- source — [sinatra/sinatra — default port 4567](https://github.com/sinatra/sinatra) (github.com)
- docs — [MariaDB — Galera cluster address (replication defaults to 4567)](https://mariadb.com/docs/galera-cluster/galera-management/configuration/galera-cluster-address) (mariadb.com)
- iana — [IANA port registry — 4567 (tram)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=4567) (iana.org)

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