This Jenkins instance appears to be offline

1. It has something to do with SSL

Change url to use http instead of https

bash

vi /var/lib/jenkins/hudson.model.UpdateCenter.xml

<?xml version='1.1' encoding='UTF-8'?>
<sites>
  <site>
    <id>default</id>
    <url>http://updates.jenkins.io/update-center.json</url>
  </site>
</sites>





<?xml version='1.1' encoding='UTF-8'?>
<sites>
  <site>
    <id>default</id>
    <url>http://updates.jenkins.io/update-center.json</url>
  </site>
</sites>

2. Restart Jenkins service

bash

 service jenkins restart