Network port ranges serve as filter criteria in network communication protection rules.
In ePO - On-prem, select Menu → Data Protection → DLP Policy Manager → Definitions.
In the left pane, select Network Port, then click Actions → New.
You can also edit the built-in definitions.
Enter a unique name and optional description.
Enter the port numbers, separated by commas, and optional description, then click Add.
When you have added all required ports, click Save.