Examine the server's configuration file:
Find the http-listener element.
Inspect the value of the port attribute.
Be sure to enter the correct port number when invoking the server.
A different port number was specified during installation.
A previous installation exists.
If the specified port number is already taken by another application when the server is started, the port number rolls forward to the next available number. For example, if a server is already running on the default 8080 port, the new Application Server instance uses port number 8081. If two servers are running, the port number rolls to 8082, and so on.