The old mms:// streaming protocol from Windows Media Services — retired hardware and retired software.
MMS is Microsoft's proprietary streaming protocol for Windows Media, documented as [MS-MMSP], using TCP 1755 for the control and data stream (with a UDP variant on the same number for the media path). Microsoft deprecated it in favour of RTSP with Windows Media Services 9 Series in 2003 and dropped server support in the Windows Server 2008 release, keeping mms:// URLs only as a rollover hint that made players try RTSP first. Anything still answering on 1755 is a streaming server old enough to predate that change, or an embedded encoder shipped with one.
Do not expose
Reaching this port means running server software that has been out of support for well over a decade and receives no security fixes — the exposure problem is the vintage of the code, not the protocol's design.
$ nc -vz -w 3 TARGET 1755Seen 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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