Hi. I have a J2EE application deployed on OAS (10.1.3.5.0) three times. Each application has its own OC4J container (with jdbc connection). All applications have the same IP address except port number.
Strange thing - when I run all applications in new browser instances (I tried IE and Chrome) - the applications somehow affect each other. When I log out from one, the other two are logged out too (after attempt to go to new page). Different browsers don't affect each other, applications from different servers don't do that too.
Before I set up some logging in application, I rather ask whether I'm not missing some important knowledge. Some substantial OAS setting or some concept of browsers' behaviour.
It means that all your application instances share a session. By default session cookie is enabled. So all of them on the same browser instance receive the same session cookie per browser type. That is weird behavior ...
You should dig the administrative and deployment documentation for OAS.