Configure local communication ports

Overview

Management servers open outbound connections to nodes that have HTTPS agents, and nodes that have the HTTPS agent open outbound connections to management servers, as the figure below shows. A management server (1) opens these connections, for example, to deploy policies and instrumentation, for heartbeat polling, and to launch actions. An HTTPS agent (2) opens these connections, for example, to send messages and action responses.

By default, management servers and nodes use local port 0 for outbound connections, which means that the operating system allocates the local port for each connection. Typically, the operating system will allocate local ports sequentially. For example if the operating system allocated local port 5055 to an Internet browser, and then the HTTPS agent opens a connection, the HTTPS agent receives local port 5056.

However, if a firewall restricts the ports that you can use, you can configure management servers and nodes to use a specific range of local ports instead.

CLIENT_PORT parameter syntax

You configure local communication ports by setting the CLIENT_PORT parameter in the bbc.http name space on the management server or node. You can configure this parameter in the following ways:

• Configure the values in the HTTPS agent installation defaults. This is recommended if you need to configure local communication ports for large numbers of nodes. You must plan and configure the installation defaults before you create or migrate your nodes.
• Use ovconfchg or ovconfpar at a command prompt.

The value must be a range of ports in the following format:

<lower port number>-<higher port number>

For example, if the firewall only allows outbound connections that originate from ports 5000 to 6000 you would use the following value:

5000-6000

To configure local communication ports using ovconfchg

1. Open a command prompt on the management server or node.
2. On nodes that run a UNIX or Linux operating system, ensure that the PATH variable contains the path to the agent commands.
   • On HP-UX, Solaris, or Linux, type export PATH=/opt/OV/bin:$PATH and then press Enter.
   • On AIX, type export PATH=/usr/lpp/OV/bin:$PATH and then press Enter.
   • On Tru64, type export PATH=/usr/opt/OV/bin:$PATH and then press Enter.

3. Specify the range of local ports that the management server or node can use for outbound connections by typing the following command:

   ovconfchg -ns bbc.http -set CLIENT_PORT <lower port number>-<higher port number>

NOTE:
When you use the command ovconfchg on a management server that runs in a cluster, add the parameter -ovrg server.

Related Topics:

• Configure HTTPS agent installation defaults
• ovconfchg
• ovconfpar

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