The following section deals with CORBA communication exclusively. If you are using gRPC for communication between components, you may skip the information here.

When a client communicates with a server via CORBA, each client must keep open a TCP connection through which it passes commands to the server and receives operation results and events from the server. By default, the GlassFish ORB provides resources for up to 240 connections.

If you expect connections from more than 230 concurrent JVMs, you should set the ORB's TCP connection pool size to the number of concurrent clients plus 10, granting some headroom. To this end, you have to set the system property com.sun.corba.ee.connection.ORBHighWaterMark to the desired numeric value.

If you are unsure about the maximum number of concurrent clients, use the number of concurrent logins specified in your license as a safe approximation.