mod_ajp and Load-Balancing Issue

Hi,

I've two tomcat servers being proxied and load-balanced by httpd using
mod_ajp (using balancer:). However, it seems when the proxy switches
from one server to another, the user session gets lost.

Could people recommend a way to correct my setup for doing
load-balancing with this scenario?

enough, it seemed to have functioned well when using mod_jk.
--

Richi