The resource-manager port of a PBS or TORQUE compute node's MOM daemon.
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.
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.
$ nc -vz -w 3 TARGET 15003Seen 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.
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Corrections or a missing port? Reply @rimrocksystems.