# WHATPORT(3998)

## NAME

port 3998 — DNX (Distributed Nagios eXecutor) — DNX — the abandoned Nagios add-on that farmed check plugins out to a cluster of worker nodes.

Protocol: TCP  
IANA: dnx

## DESCRIPTION

IANA registers 3998 as dnx, "Distributed Nagios Executor Service", a port the project specifically asked for. DNX is a Nagios event-broker module plus server and client daemons: the server dequeues checks from Nagios and hands them to dnxClient worker nodes, which run the plugin and return the result, spreading check load across machines. Upstream stalled — the last SourceForge release is 0.20.1 from 2013, still labelled alpha — and Nagios' own library now points people at Mod-Gearman instead. A listener on 3998 is an old monitoring cluster nobody has migrated.

## EXPOSURE

**Do not expose.** The whole point of the port is dispatching commands for worker nodes to execute, and the code has been unmaintained since 2013 — keep it strictly on the monitoring network.

## CHECK

```sh
nc -vz TARGET 3998
```

## SEE ALSO

- docs — [Distributed Nagios eXecutor (DNX) on SourceForge](https://sourceforge.net/projects/dnx/) (sourceforge.net)
- iana — [IANA port registry — 3998 (dnx)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3998) (iana.org)

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