JSP switching two different web application...

I am facing a problem when i am switching from one web application to another. Actually i have provided a link on a page in the first application for switching to the second application and both the applications are deployed on two different managed servers on weblogic server. i have used response.sendRedirect(URL) for this purpose .Though i am able to switch onto the other application and the page for the second web application opens up successfully in a frame But as the user clicks on some other link on the links provided for the first application, i lose the session and all session data.

This is also showing abnormal bahaviour in the sense that when i have deployed my first web application on my local weblogic sever and second application is deployed in Linux environment on weblogic server then everything is working fine .

I am not able to get the reason ..
if any one is having any idea about this then please help me out.