HTTP Transports: Allows you to add to or configure the transports
associated with the Web container. WebSphere maintains a counter for HTTP
transport ports. The counter starts at port 9080 for HTTP and 9443 HTTPS.
When this option is selected, and a new application server is created,
WebSphere assigns the next port number available to the Web container
HTTP transports, for example 9081 for HTTP and 9444 for HTTPS.
Port numbers must be unique for each application server instance on a given
machine.
I see this on page 424 of sg24-6195-00. Are you adding more ports on the view shown when HTTP Transport is clicked in figure 13-5?