The federation port — how one XMPP server talks to another so users on different domains can chat.
RFC 6120 assigns 5269 to XMPP server-to-server streams. When a user on one domain messages a user on another, the sending server looks up the target's _xmpp-server._tcp SRV record and opens a stream here, authenticating with TLS plus either certificates or server dialback. Prosody, ejabberd, and Openfire enable it whenever federation is on. It carries no client logins, so it appears only on actual XMPP servers.
Fine to expose
Federation only works if this is publicly reachable; the risk to manage is spam and abusive peers, not exposure itself.
$ dig +short SRV _xmpp-server._tcp.TARGET && nc -vz -w 3 TARGET 5269Seen 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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Corrections or a missing port? Reply @rimrocksystems.