A dead registration — Direct Cable Connect Manager — with nothing in common use behind it.
IANA registers 5679 as dccm, "Direct Cable Connect Manager", assigned to an individual and tied to the direct-cable networking era of consumer Windows. No widely deployed software listens here now. If 5679 is open on a machine you own, it belongs to some local application that picked the number, so identify it by process rather than by the registry.
Expose with care
Nothing well-known claims this port, so an open 5679 is an unidentified service. Find the owning process before deciding whether it may be reachable.
$ sudo lsof -nP -iTCP:5679 -sTCP:LISTENSeen 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.