how to decide the correct value for connection_pool_size

Hi I am running Tomcat 4.12, IIS 6.0 and newest JK. How do I determine the correct values for connection_pool_size I sometimes get this error: [Sat Jul 14 10:19:19 2007] [1388:5176] [error] jk_isapi_plugin.c (1507): Failed to obtain an endpoint to service request - your

error in isapi.log: Failed to obtain an endpoint to service...

Hi I am seeing this error in my isapi.log, I am running IIS 6.0, tomcat 4.1 and jk 1.2.23 ...[5228:6988] [error] jk_isapi_plugin.c (1507): Failed to obtain an endpoint to service request - your connection_pool_size is probably less than the threads in your web server! Does anyone

error in stderror.log: connection timeout reached...

Hi I am seeing this error in my stderror.log, I am running IIS 6.0, tomcat 4.1 and jk 1.2.23 Jul 8, 2007 7:38:37 PM org.apache.jk.common.ChannelSocket processConnection INFO: connection timeout reached Does anyone know what this means, and what the cure is? Thanks, Rasmus