New session id on each request... (no replies)

I have Nginx as a reverse proxy in front of a Tomcat server running a webapp.
This works ok using Firefox but not Chrome or IE... When using Chrome or IE, the JSESSIONID gets a new value for each request (instead of keeeping the same value as it should).
Are there some settings I am missing to fix this?

(Using Apache it works for all browsers but I want to use Nginx.... :) )


Regards,

BTJ