Two very different things: a Ruby Sinatra app in development, or a Galera cluster's replication channel.
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.
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.
$ curl -sI --max-time 5 http://TARGET:4567/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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