Use the newst mod_jk 1.2.35
The newest version has some important bug fixes particualry for
Microsoft IIS Web server.
It has been versified and confirmed as 'fixer' for couple of users and customers
I have already uploaded sources and modified jb-ep-6-xb branch spec file.
Porting that to RHEL5/RHEL6 should be trivial by incrementing the versions
and updating sources file from jb-ep-6-xb branch.