# WHATPORT(15004)

## NAME

port 15004 — PBS/TORQUE pbs_sched — Where a PBS or TORQUE batch server contacts its scheduler.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

pbs_server looks for the scheduler on the loopback address at port 15004 unless started with -S; pbs_sched binds it. It completes the 15001-15005 block that TORQUE and PBS use (server, MOM, MOM resource manager, scheduler, trqauthd). Seeing it open means an HPC head node. The port is unassigned at IANA — the number comes from the PBS source, not a registration.

## EXPOSURE

**Do not expose.** Normally a loopback-only conversation between two daemons on the head node; a scheduler port answering from outside the cluster is a misconfiguration.

## CHECK

```sh
sudo lsof -nP -iTCP:15004 -sTCP:LISTEN
```

## SEE ALSO

- source — [TORQUE — pbs_server(8) man page (scheduler on port 15004)](https://github.com/adaptivecomputing/torque) (github.com)
- source — [OpenPBS source repository](https://github.com/openpbs/openpbs) (github.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)

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HTML: <https://whatport.net/15004/> · JSON: <https://whatport.net/15004.json> · full dataset: <https://whatport.net/ports.json>