I have a tomcat application running on Fedora Core 5 Tomcat 5.5.15 Sun Java 1.5 and Postgres 8.1. When I attempted to migrate it to CENTOS 5 with Tomcat 5.5.23 and the same Java and Postgres the application runs but loses the session object between pages. The symptoms are the session ID changes from page to page and printing the session object shows the [email protected] number changes as well. The problem does not appear to happen with the jsp-examples. I monitored the cookie and the session ID in the cookid did not change.