This Jenkins instance appears to be offline
1 . I t 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>htt p ://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