虚拟机运行下载更新jenkins插件失败

jenkins安装更新插件失败，

>java.io.IOException: Server returned HTTP response code: 503 for URL: https://get.jenkins.io/plugins/jquery/1.12.4-1/jquery.hpi
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1291)
Caused: java.io.IOException: Failed to load https://updates.jenkins.io/download/plugins/jquery/1.12.4-1/jquery.hpi to /root/.jenkins/plugins/jquery.jpi.tmp
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1302)
Caused: java.io.IOException: Failed to download from https://updates.jenkins.io/download/plugins/jquery/1.12.4-1/jquery.hpi 
    at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1336)
    at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1893)
    at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:2205)
    at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1867)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:121)
    at java.lang.Thread.run(Thread.java:748)

如图

解决办法

一，有可能是下载源有问题
已知有三个源

https://updates.jenkins.io/update-center.json（或https://updates.jenkins.io/update-center.json）
https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json
http://mirror.esuni.jp/jenkins/updates/update-center.json
具体位置

拉到最后，如下图换源

办法二，换网络
我整了一下午也没想到这么解决，最后一个技术大牛告诉我，换一下网络试试。
真的换成手机网络好了。开心