Specify a range of ports to allow for connections that are required internally as well as those explicitly used by an application. The number of ports required depends on the application and the facilities it uses. Typically, this is the number of sessions the application uses plus three or four additional ports. If an application is having difficulty making connections, increase the number of ports in the range.

Connection pooling has an effect on how quickly a port can be reused. In JMS, connection pooling is switched on by default and it might be several minutes before a port can be reused. Connection errors might occur in the meantime.

For real-time connections, the local address determines which of the local network interfaces is used for multicast connections. When specifying a local address for a real-time connection, do not include a port number. A port number is not valid for multicast and, if specified, causes a failure at connect time.