nano /var/lib/unifi/system.properties

unifi.shutdown.port=8081 (for management purpose)
unifi.http.port=8080 (device inform)
unifi.https.port=8443 (controller UI / API)
portal.http.port=8880 (portal redirect port for HTTP)
portal.https.port=8843 (portal redirect port for HTTPs)
unifi.db.port=27117 (local-bound port for DB server)
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