Understanding WebSphere Portal login procedure

WebSphere portal executes certain login / logout command whenever any portal user logs in out of the portal. The classes for login/logout mechanism are specified in the below property file

/AppServer/lib/app/config/services/ConfigService.properties

Default values for these command are: 

command.login = LoginUserAuth
command.logout = LogoutUserAuth

The default login command executes the following sequence:

• WebSphere Application Server login
• WebSphere Portal JAAS login
• WebSphere Portal user login
• Resume session
• Browsers redirect (302)

The default logout command executes following sequence:

• Suspend User Session
• Portlet user logout
• WebSphere Application Server logout
• Browser redirect (302)