1.1) Make sure that you have configured Apache to use the Prefork MPM (not the Worker MPM) to avoid hangs caused by an AJP bug. See here for details.
1.2) Ensure that an AJP connector is defined in your [tomcat]/conf/server.xml file. This is the case by default, so you probably don't need to change anything. There should be a line like the following in server.xml: