The missing plugin is the Java plugin that support runnign applets. To install, see http://java.sun.com/javase/6/webnotes/install/jre/manual-plugin-install-l.... You did not say if you were running 64-bit or 32-bit Centos. If 32-bit, you are OK. If 64-bit, you will have to uninstall Firefox (assuming you installed the packaged version that came with Centos) and install Firefox from its download site before installing the plugin. The plugin works only with 32-bit browsers (the Firefox download site has only 32-bit browsers, while 64-bit Linux distros usually ship 64-bit browsers). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4203790#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...