E Managing Oracle Database Port Numbers

During installation, Oracle Universal Installer assigns port numbers to components from a set of default port numbers. This appendix lists the default port numbers and describes how to change the assigned port after installation. It includes information about the following topics:

About Managing Ports
Viewing Port Numbers and Access URLs
Port Numbers and Protocols of Oracle Components
Changing the Oracle Enterprise Management Agent Port
Changing the Oracle Enterprise Manager Database Control Ports

E.1 About Managing Ports

During installation, Oracle Universal Installer assigns port numbers to components from a set of default port numbers. Many Oracle Database 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 host. Enter the following command to identify the ports currently used on your computer:

$/bin/netstat -a

Most port numbers are assigned during installation. Every component and service has an allotted port range, which is the set of port numbers Oracle Database attempts to use when assigning a port. Oracle Database starts with the lowest number in the range and performs the following checks:

Is the port used by another Oracle Database installation on the host?

The installation may be up or down 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, even a non-Oracle Database process.
Is the port listed in the /etc/services file?

If the answer to any of the preceding questions is yes, Oracle Database moves to the next highest port in the allotted port range and continues checking until it finds a free port.

E.2 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. In addition, ports for some Oracle Database applications are listed in the portlist.ini file. This file is located in the $ORACLE_HOME/install directory.

If you change a port number, it is not updated in the portlist.ini file, so you can only rely on this file immediately after installation. To find or change a port number, use the methods described in this appendix.

E.3 Port Numbers and Protocols of Oracle Components

The following table lists the port numbers and protocols used by components that are configured during a single instance database 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
Oracle Net Services Listener Enables Oracle client connections to the database over the Oracle Net Services protocol. You can configure it during installation. To reconfigure this port, use Net Configuration Assistant.	1521	Port number changes to the next available port. Modifiable manually to any available port.	TCP
Connection Manager Listening port for Oracle client connections to Oracle Connection Manager. It is not configured during installation, but can be configured manually by editing the `cman.ora` parameter file. You can find the file under `/network/admin` directory.	1630	1630	TCP
Oracle Enterprise Manager Database Control HTTP port for Enterprise Manager Database Control. It is configured during installation. "Changing the Oracle Enterprise Manager Database Control Ports" explains how to modify its port number.	1158	5500–5519	HTTP
Oracle Enterprise Manager Database Control RMI port for Enterprise Manager Database Control. It is configured during installation."Changing the Oracle Enterprise Manager Database Control Ports" explains how to modify its port number.	5520	5520–5539	TCP
Oracle Enterprise Manager Database Control JMS port for Enterprise Manager Database Control. It is configured during installation. "Changing the Oracle Enterprise Manager Database Control Ports" explains how to modify its port number.	5540	5540–5559	TCP
Enterprise Manager Database Control Agent HTTP port for Enterprise Management Agent. It is configured during installation. "Changing the Oracle Enterprise Management Agent Port" explains how to modify its port number.	3938	1830–1849	HTTP
Oracle XML DB The Oracle XML DB HTTP port is used if web-based applications must access an Oracle database from an HTTP listener. It is configured during installation, but you cannot view it afterward. See Also: "Using HTTP(S) on a Standard Port Instead of an Oracle XML DB Default Port" in Oracle XML DB Developer's Guide	0	Configured Manually	HTTP
Oracle XML DB The Oracle XML DB FTP is used when applications must access an Oracle database from an FTP listener. It is configured during installation, but you cannot view it afterward. See Also: "Using FTP on the Standard Port Instead of the Oracle XML DB Default Port" in Oracle XML DB Developer's Guide	0	Configured Manually	FTP
Cluster Synchronization Service (CSS) CSS daemon internode connection for the GM layer. The port number is assigned automatically. You cannot view or modify it. This port is used exclusively with the cluster interconnect, which is private network that is physically separated from the public network.	42424	Dynamic	UDP
Oracle Cluster Registry The port number is assigned automatically during installation. You cannot view or modify it afterward.	Dynamic	Dynamic	UDP

E.4 Changing the Oracle Enterprise Management Agent Port

To find the current setting for the Oracle Management Agent port, search for EMD_URL in the $ORACLE_HOME/host_sid/sysman/config/emd.properties file.

To change the Oracle Management Agent HTTP port, use the emca -reconfig ports command:

emca -reconfig ports -AGENT_PORT 1831

E.5 Changing the Oracle Enterprise Manager Database Control Ports

To find the current HTTP, RMI, and JMS port settings, search in the following files:

HTTP port: Search for REPOSITORY_URL in the $ORACLE_HOME/host_sid/sysman/config/emd.properties file.
RMI port: Search for the port attribute in the rmi-server tag in the $ORACLE_HOME/oc4j/j2ee/OC4J_DBConsole_host_sid/config/rmi.xml file.
JMS port: Search for the port attribute in the jms-server tag in the $ORACLE_HOME/oc4j/j2ee/OC4J_DBConsole_host_sid/config/jms.xml file.

To change the Oracle Enterprise Manager Database Control ports, use the emca -reconfig ports command:

$ORACLE_HOME/bin emca -reconfig ports option setting

where option can be:

DBCONTROL_HTTP_PORT: Sets the HTTP port, for example:
```
emca -reconfig ports -DBCONTROL_HTTP_PORT 1820
```
RMI_PORT: Sets the RMI port, for example:
```
emca -reconfig ports -RMI_PORT 5520
```
JMS_PORT: Sets the JMS port, for example:
```
emca -reconfig ports -JMS_PORT 5521
```

You can enter multiple -reconfig port settings in one line, for example:

emca -reconfig ports -DBCONTROL_HTTP_PORT 1820 -AGENT_PORT 1821 -RMI_PORT 5520