Sun Java Enterprise System 5 Release Notes for UNIX

After installing Domain Administration Server, Node Agent is listed as installed and compatible (6379283)

If you install the Application Server Domain Administration Server, the Application Server Node Agent is listed as installed and compatible in subsequent installation sessions. This issue arises because the Domain Administration Server and Node Agent use the same set of packages and differ only in configuration.

Solution None. The software to support node agents is installed. To create a node agent, use the asadmin create-node-agent command. See create-node-agent(1) for more information.