{
  "port": 4111,
  "protocol": "tcp",
  "service": "Xgrid",
  "oneLiner": "Apple's discontinued Xgrid distributed-computing service — a live one means a very old Mac.",
  "whatItIs": "Xgrid was Apple's cluster-computing framework in Mac OS X and Mac OS X Server: an Xgrid controller accepted job submissions from clients and farmed tasks out to agent machines, and IANA still carries the port under the name xgrid. Apple removed Xgrid in OS X Mountain Lion, so nothing current ships it. Finding 4111 open today points at a Mac left on 10.7 or earlier with Xgrid still enabled.",
  "exposure": {
    "verdict": "never",
    "note": "It accepts job submissions — remote execution — from an unmaintained, end-of-life service stack; there is no configuration that makes this safe to publish."
  },
  "checkCommand": "nc -vz -w 3 TARGET 4111",
  "links": [
    {
      "title": "IANA port registry — 4111 (xgrid)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=4111",
      "kind": "iana"
    }
  ]
}