You'll need to provide more detail about what you have discovered as you've investigated the failure. For example:
- Which Linux distrubution are you using?
- Which Jenkins installation method did you use?
- Which Jenkins version did you install?
- Did the installation complete successfully as reported by the operating system?
- What does the browser report when you attempt to connect?
- Is the 'java -jar jenkins.war' command running?
- Is something else listening on the port you were connecting from the browser?
- Were there any messages which surprised you or seemed unexpected?
Mark Waite