HTTP Error 403: Forbidden By Rule  

The most common cause for this error is an incorrect URL specified when you attempt to invoke Web application.

• Carefully check the syntax of the URL.

• Check the process, function and partition name.

Another common cause of this error is an authority problem.

• If using anonymous access, check the Default User to identify the associated user profile.

• If using an IBM i Web Server, check that the IBM i user profile has authority on the CGI-BIN library and files.

You also get this error if you haven't web-enabled your application: LWEBSF, process web-enabled, recompile, web-enable from Administrator.

Also check ICS configuration: Bindspecific ON/OFF values.