APC's UPS shutdown channel — PowerChute Network Shutdown talking to a UPS Network Management Card.
IANA registers 3052 as apc-3052 to American Power Conversion, and APC/Schneider use it for PowerChute Network Shutdown: the UPS Network Management Card sends the agent a UDP packet on 3052 roughly every 25 seconds, and the loss of those packets is what triggers a graceful shutdown. Schneider's own port list for PCNS is TCP 80, 443, 3052 and 6547 plus UDP 3052. On a scan, 3052 means a server running the PowerChute agent or an APC management card, usually in a rack somewhere on a facilities network.
Do not expose
It is a power-control signalling path — anything that can forge traffic to it is adjacent to shutting servers down. Keep UPS management and PowerChute agents on a management VLAN.
$ nc -vz TARGET 3052Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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