A vendor management registration (availant-mgr) with no public protocol.
IANA registers 1122 as availant-mgr on TCP and UDP. The name points at a management channel for the registering vendor's software, but no specification is published and Nmap's frequency data shows it open on very few hosts. Because it sits just above the SSH-adjacent numbers people like to remember, an open 1122 is often a relocated SSH or another hand-picked service instead.
Expose with care
Run a version scan before assuming anything; if it turns out to be a management interface or a moved SSH, judge it on what it actually is, not on the port number.
$ nmap -Pn -p 1122 -sV TARGETSeen 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.