Apache webserver can't find tomcat - mod_jk problem?

Hi
I have recently upgraded HP-UX apache software
FROM
Apache webserver: 2.0.55
Apache tomcat : 5.5.9
TO
Apache webserver: 2.0.55
Apache tomcat : 5.5.9
I have 2 tomcats running, one JVM for a daytime service and another for a nighttime service.
So while 1 tomcat is down, the other is up, apache always running.
However, since I have upgraded, I see the following error messages in jk.log:
[Mon Nov 20 07:00:41 2006] [error] ajp_connection_tcp_get_message::jk_ajp_common
.c (949): ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8059), err=-232
The tomcat in question is up - and the messages returned are 500 responses - server configuration issue.
Get several a day.
Basically using mod_jk to bind the tomcat installations to apache webserver.
What is new though in mod_jk 1.2.10 is that a shared memory file is specified. I am wondering what happens to this memory that is used to load balance the workers when tomcats are bounced.
Issues go away after a bounce of apache - but after each tomcat has been stopped once - messages start to fail intermittently after that.
Done some googling but do not see any solutions - so here's hoping!
Thanks.

Noticed my deliberate mistake!
From
Apache 2.0.32
Tomcat 3
Still no joy with with this in terms of finding a solution to why the newer version of apache cannot find tomcat after it has been bounced.
mod_jk.so version 1.2.9 introduced the shared memory for the workers, which as far as I can is the main config change in the 2 versions of apache that came from HP.
So rolled back to the old version of apache with the new version of tomcat - and everything works fine!

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