Why does Jenkins say “This Jenkins instance appears to be offline”

Question

I have a fresh install of Jenkins 2.32.2 on Ubuntu. Opened a browser on the instance and get to a page titled Offline, with the message \"This Jenki

Answer 1

There is something wrong with the internet connection of update center.I have met the same situation with Jenkins installed on macOS.

You can try to modify the hudson.model.UpdateCenter.xml file.

Jenkins installed with .pkg package on macOS,the file path is:
/Users/Shared/Jenkins/Home/hudson.model.UpdateCenter.xml

Jenkins installed by Homebrew on macOS,the file path is:
/Users/{username}/.jenkins/hudson.model.UpdateCenter.xml

Open the file:

  
    default
    https://updates.jenkins.io/update-center.json
  

You can try to change https://updates.jenkins.io/update-center.json to:

http://updates.jenkins.io/update-center.json

or

// If you are in China or near China area,https and http are both OK.
https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/current/update-center.json

And then you can restart Jenkins by:

//loading the URL to restart Jenkins.
http://localhost:8080/restart

or

// Use Homebrew command to restart Jenkins if you installed Jenkins LTS version by Homebrew.  
brew services restart jenkins-lts