Make sure that the answer file was created.
Review the answer file.
Verify that it the values that you want to use for your silent installation.
Edit the answer file.
You can change these default values only:
Provide another directory name for Enterprise Server v3 Prelude installation files.
Provide another password for access to the Administration Console. This password is case sensitive and must be 6 to 10 characters long.
Assign another port number to the Administration Console.
Provide another user name for the administrator. This name is case sensitive.
Assign another port number to HTTP connections.
Can be set to anonymous or non_anonymous, to require administrator to log in with user name and password.
Change value to false if you do not want notifications of Update Tool checks.
Change value to false if you do not want to install standalone Update Tool.
Assign a name to the proxy host.
Assign a port number to the proxy host.
Parameters that are not in this list are system-specific. Do not change system-specific parameters.