{
  "port": 1083,
  "protocol": "tcp",
  "service": "Ansoft License Manager",
  "oneLiner": "Half of the old Ansoft (now ANSYS) FLEXlm licence-server pair for EDA and simulation tools.",
  "whatItIs": "IANA registered 1083 and 1084 together as ansoft-lm-1 and ansoft-lm-2, the licence manager for Ansoft's electromagnetic simulation tools such as HFSS. Ansoft was acquired by ANSYS in 2008 and its FLEXlm daemon was folded into the ANSYS licence manager, which now uses 1055 for lmgrd and 1056 for the ansyslmd vendor daemon. A listener on 1083 today means an engineering site is still running the legacy Ansoft licence server, or that something else claimed the port.",
  "exposure": {
    "verdict": "careful",
    "note": "FLEXlm licence daemons are unauthenticated and have a long history of parsing bugs; keep them on the engineering LAN and never publish them."
  },
  "checkCommand": "nc -vz -w 3 TARGET 1083",
  "links": [
    {
      "title": "IANA port registry — 1083 (ansoft-lm-1)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1083",
      "kind": "iana"
    },
    {
      "title": "ANSYS License Management Guide",
      "url": "https://ansyshelp.ansys.com/public/Views/Secured/corp/v251/en/pdf/ansys_license_management_guide.pdf",
      "kind": "official-docs"
    }
  ]
}