A 2004 vendor registration for a "Dossier Server"; no public protocol and almost never observed.
IANA registers 1175 as dossier, "Dossier Server", assigned in November 2004. No specification is published with the registration and Nmap's frequency data places it among the least-seen ports in this block. An open 1175 should be attributed to whatever process is actually bound, not to this name.
Expose with care
Unidentified vendor service — enumerate the process locally and keep it off untrusted networks until you know what it is.
$ sudo lsof -nP -iTCP:1175 -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.