After turning off administrative security, clear the Security is enabled on this server check box in the server configuration before restarting the server.
When testing your Rich UI application, after authenticating with JEE security, if you make a change to your application or configuration and want to retest authentication, you might have to stop the server and exit the Workbench in order to clear all saved values. For Windows, before you restart, use the Task Manager to ensure the java.exe process for the server has finished.
If you have trouble starting your server with administrative security enabled, make sure you specified SOAP as your server connection type in your WebSphere server configuration.