Fedora 19 has a very strict SELinux policy for Java applets. It de-facto blocks the Junpier Networks Java – Secure Application Manager (JSAM) to bind to a local loopback address.
See also this bug report: 1015795
To use JSAM or similar Java applets, you may disable the relevant policy with:
setsebool -P unconfined_mozilla_plugin_transition 0