This appendix lists the default port numbers and describes how to change the assigned port after installation. This appendix contains the following topics:
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. As an administrator, it is important to know the port numbers used by these services, and to ensure that the same port number is not used by two services on your system.
Most port numbers are assigned during installation. Every component and service has an allotted port range, which is the set of port numbers Oracle RAC attempts to use when assigning a port. Oracle RAC starts with the lowest number in the range and performs the following checks:
Is the port used by another Oracle Database installation on the system?
The installation can be either active or inactive at the time; Oracle Database can still detect if the port is used.
Is the port used by a process that is currently running?
This could be any process on the host, including processes other than Oracle Database processes.
If the answer to any of the preceding questions is yes, then Oracle RAC moves to the next highest port in the allotted port range and continues checking until it finds a free port.
In most cases, the Oracle Database component's port number is listed in the tool used to configure the port. In addition, ports for some Oracle Database applications are listed in the portlist.ini file. This file is located in the directory $ORACLE_HOME/install.
If you change a port number after installation, then it is not updated in the portlist.ini file, so you can rely on this file only immediately after installation. To find or change a port number, use the methods described in this appendix.
Table E-1 lists the 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.
Table E-1 Ports Used in Oracle Components
| Component and Description | Default Port Number | Port Range | Protocol | Used Only On Interconnect |
|---|---|---|---|---|
|
The port number is assigned automatically during installation. You cannot view or modify it afterward. |
Dynamic |
Dynamic |
UDP |
Yes |
|
Cluster Synchronization Service daemon (CSSD) The Cluster Synchronization Service (CSS) daemon uses a fixed port for node restart advisory messages. This port is used on all interfaces that have broadcast capability. Broadcast occurs only when a node eviction restart is imminent. |
42424 |
Dynamic |
UDP |
Yes |
|
Grid Plug and Play (GPNPD) GPNPD provides access to the Grid Plug and Play profile, and coordinates updates to the profile among the nodes of the cluster to ensure that all of the nodes have the most recent profile. |
Dynamic |
Dynamic |
TCP |
No |
|
Multicast Domain Name Service (MDNSD) The mDNS process is a background process on Linux and UNIX, and a service on Window, and is necessary for Grid Plug and Play and GNS. |
5353 |
Dynamic |
UDP/TCP |
No |
|
The port number is assigned automatically during installation. You cannot view or modify it afterward. |
Dynamic |
Dynamic |
UDP |
Yes |
|
Oracle Clusterware Daemon (CRSD) Oracle Clusterware daemon internode connection. The port number is assigned automatically during installation. You cannot view or modify it afterward. |
Dynamic |
Dynamic |
UDP |
Yes |
|
Listening port for Oracle client connections to Oracle Connection Manager. You can configure Oracle Connection Manager after installation using NETCA. |
1630 |
1630 |
TCP |
No |
|
Oracle Containers for J2EE (OC4J) The CRS Agent uses port 8888 locally to manage the lifecycle of the container. |
8888 |
8888 |
TCP |
Not applicable |
|
Shares the Oracle Net listener port and is configured during installation. To reconfigure this port, use Oracle Net Configuration Assistant (NETCA) to reconfigure the listener. |
1521 (same value as the listener) |
modifiable manually to any available port |
TCP |
No |
|
Generates events for Oracle Clusterware. The port number is assigned automatically during installation. You cannot view or modify it afterward. |
Dynamic |
Dynamic |
UDP |
Yes |
|
Oracle Grid Interprocess Communication (GIPCD) A support daemon that enables Redundant Interconnect Usage. |
42424 |
Dynamic |
UDP |
Yes |
|
Oracle Grid Naming Service (GNSD) The Oracle Grid Naming Service daemon provides a gateway between the cluster mDNS and external DNS servers. The |
53 (public), Dynamic (interconnect) |
53 (public), Dynamic (interconnect) |
UDP/TCP (public), TCP interconnect |
No |
|
Oracle HA Services daemon (OHASD) The Oracle High Availability Services (OHAS) daemon starts the Oracle Clusterware stack. |
42424 |
Dynamic |
UDP |
Yes |
|
Allows Oracle client connections to the database by using Oracle Net Services. You can configure this port during installation. To reconfigure this port, use NETCA. |
1521 |
Port number changes to the next available port. Modifiable manually to any available port. |
TCP |
No |
|
Oracle Notification Services (ONS) Port for ONS, used to publish and subscribe service for communicating information about Fast Application Notification (FAN) events. The FAN notification process uses system events that Oracle Database publishes when cluster servers become unreachable or if network interfaces fail. Use |
6100 (local) 6200 (remote) |
Configured manually |
TCP |
No |
|
Oracle Real Application Clusters The port number is assigned automatically during installation. You cannot view or modify it afterward. |
Dynamic |
Dynamic |
UDP |
Yes |
|
Oracle XML DB - FTP The Oracle XML DB FTP is used when applications need to access an Oracle database from an FTP listener. The port is configured during installation and you cannot view it afterward. Refer to Oracle XML DB Developer's Guide for information about changing this port number. |
0 |
Configured manually |
FTP |
No |
|
The Oracle XML DB HTTP port is used if Web-based applications need to access an Oracle database from an HTTP listener. The port is configured during installation and you cannot view it afterward. Refer to Oracle XML DB Developer's Guide for information about changing this port number. |
0 |
Configured manually |
HTTP |
No |