First of all: Don't use JForum 2.1.9. That version has long been obsolete and has numerous security holes. Get the latest version 2.4.1 from
https://sourceforge.net/projects/jforum2/, or -even better- build it from source, as there are numerous improvements and fixes that have not been formally released (but which are stable).
Secondly, what URL are you trying to access? And are there any error messages either in the
Tomcat logs or in the JForum-specific log?