Restrict the use of low port numbers from 1 to 1023?

When enabled, ports 1 through 1023 are reserved for authorized applications. This can be enabled for UPD and/or TCP applications. When enabled, applications using ports 1 to 1023 must be authorized in one of the following ways:

  1. The port must be explicitly reserved for the job name of the application.

  2. The application must be APF authorized.

  3. The application must be an OMVS superuser (UID(0)).