PROOF, the Parallel ROOT Facility — a physics analysis cluster accepting remote compute sessions.
PROOF lets a CERN ROOT user run an analysis across a cluster of worker nodes, and 1093 is its registered port: first for the standalone proofd daemon, and later for xproofd, the XRootD-based replacement that froze proofd's development. It turns up on high-energy-physics and other scientific analysis clusters, usually next to XRootD on 1094. A connection here asks the far side to spawn worker processes and run user code.
Do not expose
The service exists to execute code submitted by remote users. Restrict it to the cluster's own network and trusted submit hosts, with authentication configured — never expose it to the internet.
$ nc -vz -w 3 TARGET 1093Seen 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.
Get Beige Box →also available as JSON · Markdown
Corrections or a missing port? Reply @rimrocksystems.