jenkins-plugin installed error

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Faults

There is an error occurred during initialization of the jenkins:

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Offline
This Jenkins instance appears to be offline.
For information about installing Jenkins without an internet connection, see the Offline Jenkins Installation Documentation. 

You may choose to continue by configuring a proxy or skipping plugin installation.

Solution

In my case, it has something to do with SSL. I manage to fix it by editing /Users/Shared/Jenkins//Home/hudson.model.UpdateCenter.xml and change url to use “http” instead of “https”.

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

you can also use the available url:
https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/stable-2.7/update-center.json

Restart jenkins and reload the website, it no longer shows offline.