If you need to update the version of Tomcat that you originally installed for use with iXp, follow the steps below...
Release : 11.3
Component : CA WORKLOAD AUTOMATION AE IXP
Download a newer Tomcat build from http://tomcat.apache.org/.
Stop the current Tomcat on your iXp server.
At this point you can either rename the current Tomcat directory and extract the new Tomcat tar into the same path as you have been using, or you can create a new path for the newer Tomcat and leave the older one as-is. If you decide to create a new path for the newer Tomcat, make sure to update the CATALINA_HOME variable in your iXp user's environment so that it points to the new Tomcat.
Once the new Tomcat is extracted, copy the following two files from the older Tomcat directory to the new...
/lib/jtds-1.2.jar to /lib
/webapps/ixp.war to /webapps
Restart Tomcat using the startup.sh from the new Tomcat directory.