# WHATPORT(15003)

## NAME

port 15003 — PBS/TORQUE pbs_resmom — The resource-manager port of a PBS or TORQUE compute node's MOM daemon.

Protocol: TCP/UDP

## DESCRIPTION

TORQUE and its PBS ancestors hard-code a block of ports for the batch system: 15001 for pbs_server, 15002 for the MOM's server channel, 15003 for MOM resource-management requests (PBS_MANAGER_SERVICE_PORT, service name pbs_resmom), and 15004 for the scheduler. A listener on 15003 means the machine is a compute node in an HPC cluster running pbs_mom. IANA has never assigned 15003, so the convention lives in the source and in the /etc/services block the packages install.

## EXPOSURE

**Do not expose.** Batch-system RPC between nodes that trust each other on a private cluster network; there is no authentication story that makes it safe to reach from the internet.

## CHECK

```sh
nc -vz -w 3 TARGET 15003
```

## SEE ALSO

- source — [TORQUE — pbs_ifl.h (PBS_MANAGER_SERVICE_PORT 15003)](https://github.com/adaptivecomputing/torque) (github.com)
- source — [OpenPBS source repository](https://github.com/openpbs/openpbs) (github.com)

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