Registered to ARDUS multicast file transfer; not seen in general scanning.
IANA assigns 1117 to ardus-mtrns, "ARDUS Multicast Transfer", one of a small group of ARDUS registrations for a multicast bulk-transfer product. There is no public protocol document, and Nmap's data shows it open on a negligible share of hosts. An open 1117 almost certainly belongs to unrelated local software.
Expose with care
Unknown vendor protocol — identify the process; multicast transfer tooling is designed for a controlled LAN, not the internet.
$ sudo lsof -nP -iTCP:1117 -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.