How can I configure EP for when user couldn't logon on if a session exists?

Question

Hi everybody
I need configure on SAP EP this condition, but I don't know how can I do it?
1. User 1, logon to SAP EP on computer 1.
2. Then the user changes the ubication, then the user try to logon on computer 2, when he try to log on SAP EP. It returns and error because, a session of logon is on.
Note: SAP EP can't permit, that any user can logon for more two times on server.

Answer 1

I don't think you can quiet achive that. Reason being portal is a stateless. That means when you make initial request to portal, make a logon and then land at the page having some roles, navigation menus, content area etc all it store is a cookie. It neither store any information of who has just logged on nor who navigated from Role A to Role B.
When you navigate through TLN or call an iView, portal consider it as a new request. This time too portal does not know who has made a request. Now the question is how does it know if a specific iView is to be displayed as it is assigned to you or not? This is done using a cookie named saplogon ticket. When you make a request inside portal, all it have is this cookie and no information of who you are? So it just checks the cookie for the authorization and OKs the request and hence you get access to iView or a role or whatever.
Now coming back to your scenario, when user has already logged on from computer 1, say saplogon ticket1 is created and is used for further navigation and authnetication. However, when you try to logon from computer 2, your portal session does not have any information about saplogon ticket1, instead it generates its own cookie say saplogon ticket2.
That means, portal cannot retain the state of the earlier request made by you from computer 1.
I hope this clears your question.
Ameya