{
  "port": 8081,
  "protocol": "tcp",
  "service": "HTTP alternate; Sonatype Nexus Repository",
  "oneLiner": "The port you use when 8080 is taken — and Nexus Repository Manager's default.",
  "whatItIs": "IANA registers 8081 as sunproxyadmin, Sun's old proxy admin service, and Nmap still labels it `blackice-icecap` after a long-dead IDS console. Neither matters today: 8081 is the standard second HTTP port, and its most recognisable occupant is Sonatype Nexus Repository, whose documentation has you browse to `http://localhost:8081/` after install. Artifact proxies, second app instances and container sidecars fill in the rest.",
  "exposure": {
    "verdict": "careful",
    "note": "A Nexus instance on 8081 is an admin console plus your build artifacts, and it ships with a well-known default admin account that must be changed at first login. Public artifact mirroring can be deliberate; the console being public rarely is."
  },
  "checkCommand": "curl -sI http://TARGET:8081/",
  "links": [
    {
      "title": "Sonatype — Nexus Repository installation (UI on port 8081)",
      "url": "https://help.sonatype.com/en/installation-methods.html",
      "kind": "official-docs"
    },
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry — 8081 (sunproxyadmin)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=8081",
      "kind": "iana"
    }
  ],
  "ianaName": "sunproxyadmin"
}