# engine ports

TERR engines running under the TERR service require open ports to communicate. The first available port, and the range to the last available port, are determined by these two settings.

The defaults specify a range between 61001 and 62000.

Configuration property | Default setting | Description
--- | --- | ---
`engine.port.min` | `61001` | The first specified available port set for a TERR engine.
`engine.port.range` | `1000` | This value, added to the value specified in `engine.port.min`, indicates the range of the ports available for the TERR engines.