My seam application can not work in cluster environment

[garyyyding]

I cannot login. Apache server lock me in th elogin page.But the individual node work fine.

I use Apache2.2.14(window) / mod_jk1.2.28/ jboss5.1

My application is seam(2.1.1GA) application. I use Identity to control login.
I also deploy seam example (jboss-seam-jap). It is same.

Any person can help me or give me some information?