>I am using mod_jk/ajp13  with Tomcat 3.2.1 and Apache 1.3.19   
>to access an Oracle database via JSP.
>It all works fine until I use a LoadRunner to run multiple users.   The
>application handles between 60-80 concurrent users, but then fails.  

What happen when you do the same operation with Tomcat native 
http connector ?

>I implemented mod_jk as per the mod_jk_how_to instructions.   
>I have tried tuning the workers.properties cachesize and 
>the number of connectors in server.xml.   
>I have tried to limit the number of clients in httpd.conf 

Did you set Apache to fork more clients to handle the load ?
The more httpd task you have in Apache the more connections
you got to Tomcat and it may help here.

>Also, I have seen this problem posted on a few sites, but have 
>not seen a resolution.   Any help would be greatly appreciated.

Could you play your config and tell us how many httpd task you
got and Ajp13 task ? A basic netstat will tell you how many
connections are open between Apache and Tomcat

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