SingleSignOn timeout

[Summers, Bert W.]

I am using the SingleSignOn class from Tomcat.
It is working good in that I have three webapps that I can be between
without a problem.
 
My issue that when one of the sessions expire it kills all the sessions in
the other webapps and I get redirected to the login screen again.
 
That is not supposed to happen is it?
I am keeping one webapps session active and then it dies.
 
Is there some setting?
 
Thanks.