session sharing still bad

[Fleming Shi]

After I changed <default-web-app... shared="true"> between 2 web-sites, the 
session data I place use setAttribute and getAttribute still don't sync 
up.  That means the session data is not shared.  I messed around with 
orion-web.xml also, playing with <session tracking> tag, not much 
luck.  Any help would be greatly appreciated.