Review the default port numbers. If needed, use these steps to change assigned ports after installation.

• About Managing Ports
  During installation, Oracle Universal Installer (OUI) assigns port numbers to components from a set of default port numbers. Many Oracle Real Application Clusters (Oracle RAC) components and services use ports.
• About Viewing Port Numbers and Access URLS
  In most cases, the Oracle Database component's port number is listed in the tool used to configure the port.
• Setting UDP and TCP Dynamic Port Range for Oracle RAC Installations
  For certain configurations of Oracle RAC in high load environments it is possible for the system to exhaust the available number of sockets. To avoid this problem, expand the dynamic port range for both UDP and TCP.
• Port Numbers and Protocols of Oracle Components
  Review this information for port numbers and protocols used by components that are configured during the installation. By default, the first port in the range is assigned to the component, if it is available.
• Changing the Oracle Services for Microsoft Transaction Server Port
  In most cases, you are not required to reconfigure the port number for the Oracle Services for Microsoft Transaction Server.