apache + mod_jk + tomcat. Manager application problem

[Mirek Kopriva]

Hi I have a strange problem.
When I install tomcat + apache + mod_jk. Everything seems to work fine
(our application, examples...) except the tomcat's Manager application.
Anybody has an idea why?
I'm using
apache 2.0.52
mod_jk 1.2.15
rtomcat 5.5.12
Thanks a lot for any help.