{
  "port": 4900,
  "protocol": "both",
  "service": "HFSQL Client/Server",
  "oneLiner": "HFSQL, the database engine bundled with PC SOFT's WINDEV — its server port.",
  "whatItIs": "PC SOFT registered 4900 for HFSQL (formerly HyperFileSQL), the database engine that ships with WINDEV, WEBDEV and WINDEV Mobile. PC SOFT's documentation states the HFSQL server uses TCP 4900 by default, changeable in HFConf.ini; the companion manager service sits on 4999. You only see it around WINDEV-built business applications, which are common in France and rare elsewhere.",
  "exposure": {
    "verdict": "never",
    "note": "It is a database wire port. Keep it on a private network and reach it through the application tier or a VPN, not from the internet."
  },
  "checkCommand": "nc -vz TARGET 4900",
  "links": [
    {
      "title": "PC SOFT — HFSQL Client/Server: Port management",
      "url": "https://help.windev.com/en-US/?3044334=",
      "kind": "official-docs"
    },
    {
      "title": "IANA port registry — 4900 (hfcs)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=4900",
      "kind": "iana"
    }
  ]
}