{
  "port": 1755,
  "protocol": "tcp",
  "service": "MMS (Microsoft Media Server)",
  "oneLiner": "The old mms:// streaming protocol from Windows Media Services — retired hardware and retired software.",
  "whatItIs": "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.",
  "exposure": {
    "verdict": "never",
    "note": "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."
  },
  "checkCommand": "nc -vz -w 3 TARGET 1755",
  "links": [
    {
      "title": "[MS-MMSP]: Microsoft Media Server Protocol — Transport (TCP/UDP 1755)",
      "url": "https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-mmsp/b03203af-1072-4ed0-a619-2e560a789928",
      "kind": "spec"
    },
    {
      "title": "IANA port registry — 1755",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1755",
      "kind": "iana"
    }
  ]
}