For information about port numbers, see port number settings in WebSphere Application Server versions.
Unix/Linux users: Some Unix or Linux systems create an association between the host name of the machine and the loopback address -- 127.0.0.1 (Red Hat installations do this by default). In addition, the /etc/nsswitch.conf file is set up to use the /etc/hosts path before trying to look up the server using a name server. This setup can cause failures when trying to add or administrate nodes when the deployment manager or application server is running on the Red Hat system or an Unix/Linux system with the same setup.
hosts: dns files
Related reference
addNode command
removeNode command
Port number settings in WebSphere Application Server versions