Problem
In the OSSO 10g coexistence with Access Manager 11g, if a user tries to access a protected resource when the OAM server is down, the request is redirected to the OSSO 10g login page through the load balancer. If the user enters valid credentials, the resource is provided.
However, if the user deletes the Oracle HTTP Server cookie and brings the OSSO 10g server down (and brings the OAM Server up), upon accessing the protected resource the user is asked for Access Manager login (authentication). Instead, the application should be accessible without authentication.
Solution
Confirm that the migrated User Identity Store is set as the Access Manager Default Store and System Store.
See Also:
disableCoexistMode in Oracle Fusion Middleware WebLogic Scripting Tool Command Reference.