I very often use the Java Web Start of Jenkins provided at http://jenkins-ci.org/jenkins.jnlp to test out new features and/or things I want to change about the configuration I'm using of my production Jenkins Environment. I discovered on Friday that this link was not working for me (confirmed also by John Smart of Wakaleo). I couldn't find this in the issue tracker and believe it is a bug. See the attached screen shots. To test for yourself, visit http://www.wakaleo.com/books/jenkins-the-definitive-guide and click the "Launch" button under "Try out Jenkins!"