# WHATPORT(1093)

## NAME

port 1093 — PROOF (proofd / xproofd) — PROOF, the Parallel ROOT Facility — a physics analysis cluster accepting remote compute sessions.

Protocol: TCP  
IANA registry

## DESCRIPTION

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.

## EXPOSURE

**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.

## CHECK

```sh
nc -vz -w 3 TARGET 1093
```

## SEE ALSO

- iana — [IANA port registry — 1093 (proofd)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1093) (iana.org)
- docs — [proofd(1) manual page — PROOF, The Parallel ROOT Facility](https://manpages.ubuntu.com/manpages/xenial/man1/proofd.1.html) (manpages.ubuntu.com)
- source — [root-project/root — the CERN ROOT framework](https://github.com/root-project/root) (github.com)

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