For the SSO Agent:
Please open on the Agent the CA/webagent/conf/WebAgent.conf and set EnableWebAgent to NO
To disable IDM from expecting authentication from SSO:
In the iam_im.ear/user_console.war/WEB-INF/web.xml
look for FrameworkAuthFilter and set enable to true.
set Enabled to false.
This configuration should pass you directly to IDM where you should be able to login with the default 'imadmin' admin user.